Hello there, my Leatherworker friends!

The listings here tell you how many times you must complete a leve to level for the first five levels after the minimum acquisition level, as well as how many times you must complete to make a run for five or ten levels above.
Some points before moving forward:

Each listing assumes you have reached the required level with no experience past 0. Keep this is mind moving forward, because you will rarely ever be at 0 XP right when you reach a level.
Repeatable/Charity/triple turn-in leves are noted with asterisks next to their experience numbers. These listings assume you intend to make full use of these leves and turn in the requirements all three times, and hence their listed XP numbers are three times the base (plus bonuses on HQ turn-ins).
To be 100% honest, I recommend avoiding leves until level 20.
If you are looking for mass-leveling I highly recommend repeatables/triples. If for shorter bursts, Ingenuity may be better suited to your budget (though they require travel).

If you're looking for something more compact, head over to my Complete Leatherworker Leves Guide.
Most efficient leve-wise options per tier:

Level 10: Simply the Best
Level 15: Skin off Their Backs
Level 20: Fire and Hide; Packing a Punch
Level 25: Men Who Scare up Goats
Level 30: Best Served Toad; Subordinate Clause
Level 35: Suppy Side Logic; First They Came for the Heretics
Level 40: The Tao of Rabbits; It's Not a Job, It's a Calling
Level 45: Handle with Care

Remember: Crafting XP is not taken into consideration in these numbers!
(If you see any mis-types on the numbers, please let me know. I've gone through these a couple of times looking for mistakes, but they always seem to slip through.)
Level 10 leves

Quelling Bloody Rumors (Gridania) - 2230 XP (HQ: 6690 XP)
Requires: 1 Hard Leather Shoes
Completions to level: Level 10 (11,800 XP): 6 (HQ: 2)
Level 11 (15,600 XP): 7 (HQ: 3)
Level 12 (19,600 XP): 9 (HQ: 3)
Level 13 (23,700 XP): 11 (HQ: 4)
Level 14 (26,400 XP): 12 (HQ: 4)
All at once (97100 XP needed): 44 (15)
Straight from 10-20 (300200 XP): 135 (HQ: 45)

Saddle Sore (Gridania) - 1715 XP (HQ: 5145 XP)
Requires: 3 Hard Leather
Completions to level: Level 10 (11,800 XP): 7 (HQ: 3)
Level 11 (15,600 XP): 10 (HQ: 4)
Level 12 (19,600 XP): 12 (HQ: 4)
Level 13 (23,700 XP): 14 (HQ: 5)
Level 14 (26,400 XP): 16 (HQ: 5)
All at once (97100 XP needed): 57 (19)
Straight from 10-20 (300200 XP): 176 (HQ: 59)

The Bard's Guards (Gridania) - 2022 XP (HQ: 6066 XP)
Requires: 1 Hard Leather Wristguards
Completions to level: Level 10 (11,800 XP): 6 (HQ: 2)
Level 11 (15,600 XP): 8 (HQ: 3)
Level 12 (19,600 XP): 10 (HQ: 4)
Level 13 (23,700 XP): 12 (HQ: 4)
Level 14 (26,400 XP): 14 (HQ: 5)
All at once (97100 XP needed): 49 (17)
Straight from 10-20 (300200 XP): 149 (HQ: 50)

Simply the Best (Bentbranch) - 2598 XP (HQ: 7794 XP)
Requires: 1 Hard Leather Caligae
Completions to level: Level 10 (11,800 XP): 5 (HQ: 2)
Level 11 (15,600 XP): 7 (HQ: 3)
Level 12 (19,600 XP): 8 (HQ: 3)
Level 13 (23,700 XP): 10 (HQ: 4)
Level 14 (26,400 XP): 11 (HQ: 4)
All at once (97100 XP needed): 38 (13)
Straight from 10-20 (300200 XP): 116 (HQ: 39)

Only the Best (Bentbranch) - 2410 XP (HQ: 7230 XP)
Requires: 1 Hard Leather Harness
Completions to level: Level 10-11 (11,800 XP): 5 (HQ: 2)
Level 11-12 (15,600 XP): 7 (HQ: 3)
Level 12-13 (19,600 XP): 9 (HQ: 3)
Level 13-14 (23,700 XP): 10 (HQ: 4)
Level 14-15 (26,400 XP): 11 (HQ: 4)
All at once (97100 XP needed): 41 (HQ: 14)
Straight from 10-20 (300200 XP): 125 (HQ: 26)
Level 15 leves

Heads Up (Gridania) - 4227 XP (HQ: 12681 XP)
Requires: 1 Hard Leather Skullcap
Completions to level: Level 15-16 (30,500 XP): 8 (HQ: 3)
Level 16-17 (35,400 XP): 9 (HQ: 3)
Level 17-18 (40,500 XP): 10 (HQ: 4)
Level 18-19 (45,700 XP): 11 (HQ: 4)
Level 19-20 (51,000 XP): 13 (HQ: 5)
All at once (203,100 XP needed): 49 (HQ: 17)
Straight from 15-25 (561,200 XP): 133 (HQ: 45)

Choke Hold (Gridania) - 3872 XP (HQ: 11616 XP)
Requires: 1 Hard Leather Choker
Completions to level: Level 15-16 (30,500 XP): 8 (HQ: 3)
Level 16-17 (35,400 XP): 10 (HQ: 4)
Level 17-18 (40,500 XP): 11 (HQ: 4)
Level 18-19 (45,700 XP): 12 (HQ: 4)
Level 19-20 (51,000 XP): 14 (HQ: 5)
All at once (203,100 XP needed): 53 (HQ: 18)
Straight from 15-25 (561,200 XP): 145 (HQ: 49)

Skin off Their Backs (Gridania) - 6341 XP (HQ: 19023 XP)
Requires: 3 Aldgoat Leather
Completions to level: Level 15-16 (30,500 XP): 5 (HQ: 2)
Level 16-17 (35,400 XP): 6 (HQ: 2)
Level 17-18 (40,500 XP): 7 (HQ: 3)
Level 18-19 (45,700 XP): 8 (HQ: 3)
Level 19-20 (51,000 XP): 9 (HQ: 3)
All at once (203,100 XP needed): 33 (HQ: 11)
Straight from 15-25 (561,200 XP): 89 (HQ: 30)

Back in the Band (Hawthorne Hut) - 4227 XP (HQ: 12681 XP)
Requires: 1 Hard Leather Wristbands
Completions to level: Level 15-16 (30,500 XP): 8 (HQ: 3)
Level 16-17 (35,400 XP): 9 (HQ: 3)
Level 17-18 (40,500 XP): 10 (HQ: 4)
Level 18-19 (45,700 XP): 11 (HQ: 4)
Level 19-20 (51,000 XP): 13 (HQ: 5)
All at once (203,100 XP needed): 49 (HQ: 17)
Straight from 15-25 (561,200 XP): 133 (HQ: 45)

On Their Feet Again (Hawthorne Hut) - 4227 XP (HQ: 12681 XP)
Requires: 1 Hard Leather Espadrilles
Completions to level: Level 15-16 (30,500 XP): 8 (HQ: 3)
Level 16-17 (35,400 XP): 9 (HQ: 3)
Level 17-18 (40,500 XP): 10 (HQ: 4)
Level 18-19 (45,700 XP): 11 (HQ: 4)
Level 19-20 (51,000 XP): 13 (HQ: 5)
All at once (203,100 XP needed): 49 (HQ: 17)
Straight from 15-25 (561,200 XP): 133 (HQ: 45)
Level 20 leves

Playing the Part (Gridania) - 6625 XP (HQ: 19875 XP)
Requires: 1 Goatskin Armguards
Completions to level: Level 20-21 (56,600 XP): 9 (HQ: 3)
Level 21-22 (63,900 XP): 10 (HQ: 4)
Level 22-23 (71,400 XP): 11 (HQ: 4)
Level 23-24 (79,100 XP): 12 (HQ: 4)
Level 24-25 (87,100 XP): 14 (HQ: 5)
All at once (358,100 XP needed): 55 (HQ: 19)
Straight from 20-30 (984,000 XP): 149 (HQ: 50)

Fire and Hide (Gridania) - 15219* XP (HQ: 45657* XP)
Requires: 5 Aldgoat Leather (15 total)
Completions to level: Level 20-21 (56,600 XP): 4 (HQ: 2)
Level 21-22 (63,900 XP): 5 (HQ: 2)
Level 22-23 (71,400 XP): 5 (HQ: 2)
Level 23-24 (79,100 XP): 6 (HQ: 2)
Level 24-25 (87,100 XP): 6 (HQ: 2)
All at once (358,100 XP needed): 24 (HQ: 8 )
Straight from 20-30 (984,000 XP): 65 (HQ: 22)

My Sole to Take (Gridania) - 9650 XP (HQ: 28950 XP)
Requires: 1 Padded Leather Duckbills
Completions to level: Level 20-21 (56,600 XP): 6 (HQ: 2)
Level 21-22 (63,900 XP): 7 (HQ: 3)
Level 22-23 (71,400 XP): 8 (HQ: 3)
Level 23-24 (79,100 XP): 9 (HQ: 3)
Level 24-25 (87,100 XP): 10 (HQ: 4)
All at once (358,100 XP needed): 38 (HQ: 13)
Straight from 20-30 (984,000 XP): 102 (HQ: 34)

Hands On (Quarrymill) - 9262 XP (HQ: 27786 XP)
Requires: 1 Fingerless Goatskin Gloves
Completions to level: Level 20-21 (56,600 XP): 7 (HQ: 3)
Level 21-22 (63,900 XP): 7 (HQ: 3)
Level 22-23 (71,400 XP): 8 (HQ: 3)
Level 23-24 (79,100 XP): 9 (HQ: 3)
Level 24-25 (87,100 XP): 10 (HQ: 4)
All at once (358,100 XP needed): 39 (HQ: 13)
Straight from 20-30 (984,000 XP): 107 (HQ: 36)

Packing a Punch (Quarrymill) - 15777* XP (HQ: 47331* XP)
Requires: 3 Hard Leather Cesti (9 total)
Completions to level: Level 20-21 (56,600 XP): 4 (HQ: 2)
Level 21-22 (63,900 XP): 5 (HQ: 2)
Level 22-23 (71,400 XP): 5 (HQ: 2)
Level 23-24 (79,100 XP): 6 (HQ: 2)
Level 24-25 (87,100 XP): 6 (HQ: 2)
All at once (358,100 XP needed): 23 (HQ: 8)
Straight from 20-30 (984,000 XP): 63 (HQ: 21)
Level 25 leves

Belts Served Cold (Gridania) - 24693* XP (HQ: 74079* XP)
Requires: 3 Voyager's Belt (9 total)
Completions to level: Level 25-26 (95,200 XP): 4 (HQ: 2)
Level 26-27 (109,800 XP): 5 (HQ: 2)
Level 27-28 (124,800 XP): 6 (HQ: 2)
Level 28-29 (140,200 XP): 6 (HQ: 2)
Level 29-30 (155,900 XP): 7 (HQ: 3)
All at once (625,900 XP needed): 26 (HQ: 9)
Straight from 25-35 (1,575,300 XP): 64 (HQ: 22)

Men Who Scare Up Goats (Gridania) - 11572 XP (HQ: 34716 XP)
Requires: 1 Goatskin Targe
Completions to level: Level 25-26 (95,200 XP): 9 (HQ: 3)
Level 26-27 (109,800 XP): 10 (HQ: 4)
Level 27-28 (124,800 XP): 11 (HQ: 4)
Level 28-29 (140,200 XP): 13 (HQ: 5)
Level 29-30 (155,900 XP): 14 (HQ: 5)
All at once (625,900 XP needed): 55 (HQ: 19)
Straight from 25-35 (1,575,300 XP): 137 (HQ: 46)

Just Rewards (Gridania) - 17358 XP (HQ: 52074 XP)
Requires: 1 Goatskin Wristbands
Completions to level: Level 25-26 (95,200 XP): 6 (HQ: 2)
Level 26-27 (109,800 XP): 7 (HQ: 3)
Level 27-28 (124,800 XP): 8 (HQ: 3)
Level 28-29 (140,200 XP): 9 (HQ: 3)
Level 29-30 (155,900 XP): 9 (HQ: 3)
All at once (625,900 XP needed): 37 (HQ: 13)
Straight from 25-35 (1,575,300 XP): 91 (HQ: 31)

Quicker than Sand (Quarrymill) - 22944* XP (HQ: 68832* XP)
Requires: 3 Padded Leather Duckbills (9 total)
Completions to level: Level 25-26 (95,200 XP): 5 (HQ: 2)
Level 26-27 (109,800 XP): 5 (HQ: 2)
Level 27-28 (124,800 XP): 6 (HQ: 2)
Level 28-29 (140,200 XP): 7 (HQ: 3)
Level 29-30 (155,900 XP): 7 (HQ: 3)
All at once (625,900 XP needed): 28 (HQ: 10)
Straight from 25-35 (1,575,300 XP): 69 (HQ: 23)

No Risk, No Reward (Quarrymill) - 11033 XP (HQ: 33099 XP)
Requires: 1 Toadskin Cesti
Completions to level: Level 25-26 (95,200 XP): 9 (HQ: 3)
Level 26-27 (109,800 XP): 10 (HQ: 4)
Level 27-28 (124,800 XP): 12 (HQ: 4)
Level 28-29 (140,200 XP): 13 (HQ: 5)
Level 29-30 (155,900 XP): 15 (HQ: 5)
All at once (625,900 XP needed): 57 (HQ: 19)
Straight from 25-35 (1,575,300 XP): 143 (HQ: 48)
Level 30 leves

Best Served Toad (Gridania) - 35586* XP (HQ: 106758* XP)
Requires: 5 Toad Leather (15 total)
Completions to level: Level 30-31 (162,500 XP): 5 (HQ: 2)
Level 31-32 (175,900 XP): 5 (HQ: 2)
Level 32-33 (189,600 XP): 6 (HQ: 2)
Level 33-34 (203,500 XP): 6 (HQ: 2)
Level 34-35 (217,900 XP): 7 (HQ: 3)
All at once (949,400 XP needed): 27 (HQ: 9)
Straight from 30-40 (2,290,520 XP): 65 (HQ: 22)

Just Cinch It (Gridania) - 23912 XP (HQ: 71736 XP)
Requires: 1 Boarskin Satchel Belt
Completions to level: Level 30-31 (162,500 XP): 7 (HQ: 3)
Level 31-32 (175,900 XP): 8 (HQ: 3)
Level 32-33 (189,600 XP): 8 (HQ: 3)
Level 33-34 (203,500 XP): 9 (HQ: 3)
Level 34-35 (217,900 XP): 10 (HQ: 4)
All at once (949,400 XP needed): 40 (HQ: 14)
Straight from 30-40 (2,290,520 XP): 96 (HQ: 32)

Quality over Quantity (Gridania) - 15941 XP (HQ: 47823 XP)
Requires: 1 Boarskin Himantes
Completions to level: Level 30-31 (162,500 XP): 11 (HQ: 4)
Level 31-32 (175,900 XP): 12 (HQ: 4)
Level 32-33 (189,600 XP): 12 (HQ: 4)
Level 33-34 (203,500 XP): 13 (HQ: 5)
Level 34-35 (217,900 XP): 15 (HQ: 5)
All at once (949,400 XP needed): 60 (HQ: 20)
Straight from 30-40 (2,290,520 XP): 144 (HQ: 48)

Slave to Fashion (Costa del Sol) - 16333 XP (HQ: 48999 XP)
Requires: 1 Boarskin Choker
Completions to level: Level 30-31 (162,500 XP): 10 (HQ: 4)
Level 31-32 (175,900 XP): 11 (HQ: 4)
Level 32-33 (189,600 XP): 12 (HQ: 4)
Level 33-34 (203,500 XP): 13 (HQ: 5)
Level 34-35 (217,900 XP): 14 (HQ: 5)
All at once (949,400 XP needed): 59 (HQ: 20)
Straight from 30-40 (2,290,520 XP): 141 (HQ: 47)

Subordinate Clause (Costa del Sol) - 35586* XP (HQ: 106758* XP)
Requires: 3 Goatskin Chokers (9 total)
Completions to level: Level 30-31 (162,500 XP): 5 (HQ: 2)
Level 31-32 (175,900 XP): 5 (HQ: 2)
Level 32-33 (189,600 XP): 6 (HQ: 2)
Level 33-34 (203,500 XP): 6 (HQ: 2)
Level 34-35 (217,900 XP): 7 (HQ: 3)
All at once (949,400 XP needed): 27 (HQ: 9)
Straight from 30-40 (2,290,520 XP): 65 (HQ: 22)
Level 35 leves

Soft Shoe Shuffle (Gridania) - 21597 XP (HQ: 64791 XP)
Requires: 1 Peisteskin Crakows
Completions to level: Level 35-36 (232,320 XP): 11 (HQ: 4)
Level 36-37 (249,900 XP): 12 (HQ: 4)
Level 37-38 (267,800 XP): 13 (HQ: 5)
Level 38-39 (286,200 XP): 14 (HQ: 5)
Level 39-40 (304,900 XP): 15 (HQ: 5)
All at once (1,341,120 XP needed): 63 (HQ: 21)
Straight from 35-45 (3,126,620): 145 (HQ: 49)

Supply Side Logic (Gridania) - 57390* XP (HQ: 172170* XP)
Requires: 5 Boar Leather (15 total)
Completions to level: Level 35-36 (232,320 XP): 5 (HQ: 2)
Level 36-37 (249,900 XP): 5 (HQ: 2)
Level 37-38 (267,800 XP): 5 (HQ: 2)
Level 38-39 (286,200 XP): 5 (HQ: 2)
Level 39-40 (304,900 XP): 6 (HQ: 2)
All at once (1,341,120 XP needed): 24 (HQ: 8)
Straight from 35-45 (3,126,620): 54 (HQ: 19)

The Righteous Tools for the Job (Gridania) - 30776 XP (HQ: 92328 XP)
Requires: 1 Boarskin Ringbands
Completions to level: Level 35-36 (232,320 XP): 8 (HQ: 3)
Level 36-37 (249,900 XP): 9 (HQ: 3)
Level 37-38 (267,800 XP): 9 (HQ: 3)
Level 38-39 (286,200 XP): 10 (HQ: 4)
Level 39-40 (304,900 XP): 10 (HQ: 4)
All at once (1,341,120 XP needed): 44 (HQ: 15)
Straight from 35-45 (3,126,620): 102 (HQ: 34)

Through a Glass Brightly (Observatorium) - 21597 XP (HQ: 64791 XP)
Requires: 1 Fingerless Peisteskin Gloves
Completions to level: Level 35-36 (232,320 XP): 11 (HQ: 4)
Level 36-37 (249,900 XP): 12 (HQ: 4)
Level 37-38 (267,800 XP): 13 (HQ: 5)
Level 38-39 (286,200 XP): 14 (HQ: 5)
Level 39-40 (304,900 XP): 15 (HQ: 5)
All at once (1,341,120 XP needed): 63 (HQ: 21)
Straight from 35-45 (3,126,620): 145 (HQ: 49)

First They Came for the Heretics (Observatorium) - 58800* XP (HQ: 176400* XP)
Requires: 3 Boarskin Choker (9 total)
Completions to level: Level 35-36 (232,320 XP): 4 (HQ: 2)
Level 36-37 (249,900 XP): 5 (HQ: 2)
Level 37-38 (267,800 XP): 5 (HQ: 2)
Level 38-39 (286,200 XP): 5 (HQ: 2)
Level 39-40 (304,900 XP): 6 (HQ: 2)
All at once (1,341,120 XP needed): 23 (HQ: 8)
Straight from 35-45 (3,126,620): 54 (HQ: 18)
Level 40 leves

The Birdmen of Ishgard (Gridania) - 40661 XP (HQ: 121983 XP)
Requires: 1 Boarskin Culottes
Completions to level: Level 40-41 (324,000 XP): 8 (HQ: 3)
Level 41-42 (340,200 XP): 9 (HQ: 3)
Level 42-43 (356,800 XP): 9 (HQ: 3)
Level 43-44 (373,700 XP): 10 (HQ: 4)
Level 44-45 (390,800 XP): 10 (HQ: 4)
All at once (1,785,500 XP needed): 44 (HQ: 15)
Straight from 40-50 (4,125,800): 102 (HQ: 34)

Skirt Chaser (Gridania) - 27497 XP (HQ: 82491 XP)
Requires: 1 Boarskin Skirt
Completions to level: Level 40-41 (324,000 XP): 12 (HQ: 4)
Level 41-42 (340,200 XP): 13 (HQ: 5)
Level 42-43 (356,800 XP): 13 (HQ: 5)
Level 43-44 (373,700 XP): 14 (HQ: 5)
Level 44-45 (390,800 XP): 15 (HQ: 5)
All at once (1,785,500 XP needed): 65 (HQ: 22)
Straight from 40-50 (4,125,800): 151 (HQ: 51)

The Tao of Rabbits (Gridania) - 75780* XP (HQ: 227340* XP)
Requires: 3 Boarskin Harness (9 total)
Completions to level: Level 40-41 (324,000 XP): 5 (HQ: 2)
Level 41-42 (340,200 XP): 5 (HQ: 2)
Level 42-43 (356,800 XP): 5 (HQ: 2)
Level 43-44 (373,700 XP): 5 (HQ: 2)
Level 44-45 (390,800 XP): 6 (HQ: 2)
All at once (1,785,500 XP needed): 24 (HQ: 8)
Straight from 40-50 (4,125,800): 55 (HQ: 19)

Not So Alike in Dignity (Whitebrim) - 27887 XP (HQ: 83661 XP)
Requires: 1 Boarskin Jerkin
Completions to level: Level 40-41 (324,000 XP): 12 (HQ: 4)
Level 41-42 (340,200 XP): 13 (HQ: 5)
Level 42-43 (356,800 XP): 13 (HQ: 5)
Level 43-44 (373,700 XP): 14 (HQ: 5)
Level 44-45 (390,800 XP): 15 (HQ: 5)
All at once (1,785,500 XP needed): 65 (HQ: 22)
Straight from 40-50 (4,125,800): 148 (HQ: 50)

It's Not a Job, It's a Calling (Whitebrim) - 77751* XP (HQ: 233253* XP)
Requires: 5 Peiste Leather (15 total)
Completions to level: Level 40-41 (324,000 XP): 5 (HQ: 2)
Level 41-42 (340,200 XP): 5 (HQ: 2)
Level 42-43 (356,800 XP): 5 (HQ: 2)
Level 43-44 (373,700 XP): 5 (HQ: 2)
Level 44-45 (390,800 XP): 6 (HQ: 2)
All at once (1,785,500 XP needed): 23 (HQ: 8)
Straight from 40-50 (4,125,800): 154 (HQ: 18)
Level 45 leves

Too Hot to Handle (Gridania) - 33573 XP (HQ: 100719 XP)
Requires: 1 Raptorskin Wristbands
Completions to level: Level 45-46 (408,200 XP): 13 (HQ: 5)
Level 46-47 (437,600 XP): 14 (HQ: 5)
Level 47-48 (467,500 XP): 14 (HQ: 5)
Level 48-49 (498,000 XP): 15 (HQ: 5)
Level 49-50 (529,000 XP): 16 (HQ: 6)
All at once (2,340,300 XP needed): 70 (HQ: 24)

Handle with Care (Gridania) - 117261* XP (HQ: 351783* XP)
Requires: 3 Peisteskin Cesti (9 total)
Completions to level: Level 45-46 (408,200 XP): 4 (HQ: 2)
Level 46-47 (437,600 XP): 4 (HQ: 2)
Level 47-48 (467,500 XP): 5 (HQ: 2)
Level 48-49 (498,000 XP): 5 (HQ: 2)
Level 49-50 (529,000 XP): 5 (HQ: 2)
All at once (2,340,300 XP needed): 20 (HQ: 7)

Hang in There (Gridania) - 48858 XP (HQ: 146574 XP)
Requires: 1 Raptorskin Artisan's Belt
Completions to level: Level 45-46 (408,200 XP): 9 (HQ: 3)
Level 46-47 (437,600 XP): 9 (HQ: 3)
Level 47-48 (467,500 XP): 10 (HQ: 4)
Level 48-49 (498,000 XP): 11 (HQ: 4)
Level 49-50 (529,000 XP): 11 (HQ: 4)
All at once (2,340,300 XP needed): 48 (HQ: 16)

Tenderfoot Moments (St. Coinach's Find) - 34552 XP (HQ: 103656 XP)
Requires: 1 Hunting Moccasins
Completions to level: Level 45-46 (408,200 XP): 12 (HQ: 4)
Level 46-47 (437,600 XP): 13 (HQ: 5)
Level 47-48 (467,500 XP): 14 (HQ: 5)
Level 48-49 (498,000 XP): 15 (HQ: 5)
Level 49-50 (529,000 XP): 16 (HQ: 6)
All at once (2,340,300 XP needed): 68 (HQ: 23)

Spelling Me Softly (St. Coinach's Find) - 101763* XP (HQ: 305289* XP)
Requires: 5 Raptor Leather (15 total)
Completions to level: Level 45-46 (408,200 XP): 5 (HQ: 2)
Level 46-47 (437,600 XP): 5 (HQ: 2)
Level 47-48 (467,500 XP): 5 (HQ: 2)
Level 48-49 (498,000 XP): 5 (HQ: 2)
Level 49-50 (529,000 XP): 6 (HQ: 2)
All at once (2,340,300 XP needed): 23 (HQ: 8)

The listed experience amounts are the bare minimum. Multiple high quality turn-ins will result in much more XP.
Level 20

Gridania - Fire and Hide (5073 XP)
Requires: 5 Aldgoat Leather
Aldgoat Leather components:
1 Earth Shard
1 Aldgoat Skin
1 Alumen

Quarrymill - Packing a Punch (5259 XP)
Requires: 3 Hard Leather Cesti
2 Earth Shard
1 Wind Shard
1 Aldgoat Leather
1 Beast Sinew
1 Bronze Ingot
Level 25

Gridania - Belts Served Cold (8231 XP)
Requires: 3 Voyager's Belt
Voyager's Belt components:
3 Earth Shard
2 Wind Shard
1 Aldgoat Leather
1 Beast Sinew
1 Iron Ingot

Quarrymill - Quicker than Sand (7648 XP)
Requires: 3 Padded Leather Duckbills
Padded Leather Duckbills components:
2 Earth Shard
1 Wind Shard
1 Leather Duckbills
1 Leather
1 Undyed Cotton Cloth
Level 30

Gridania - Best Served Toad (11862 XP)
Requires: 5 Toad Leather
Toad Leather components:
3 Earth Shard
1 Gigantoad Skin
1 Alumen

Costa del Sol - Subordinate Clause (11862 XP)
Requires: 3 Goatskin Choker
Goatskin Choker components:
2 Earth Shard
2 Wind Shard
1 Aldgoat Leather
1 Diremite Sinew
Level 35

Gridania - Supply Side Logic (19130 XP)
Requires: 5 Boar Leather
Boar Leather components:
4 Earth Shard
1 Boar Hide
1 Alumen

Coerthas (Observatorium) - First They Came for the Heretics (19600 XP)
Requires: 3 Boarskin Choker
Boarskin Choker components:
4 Earth Shard
3 Wind Shard
1 Boar Leather
1 Hippogryph Sinew
Level 40

Gridania - The Tao of Rabbits (25260 XP)
Requires: 3 Boarskin Harness
Boarskin Harness components:
5 Earth Shard
3 Wind Shard
1 Boar Leather
1 Aldgoat Leather
2 Steel Ingot

Coerthas - It's Not a Job, It's a Calling (25917 XP)
Requires: 5 Peiste Leather
Peiste Leather components:
5 Earth Shard
1 Pieste Skin
1 Black Alumen
Level 45

Gridania - Handle with Care (39087 XP)
Requires: 3 Peisteskin Cesti
Peisteskin Cesti components:
7 Earth Shard
4 Wind Shard
1 Pieste Leather
1 Raptor Sinew
1 Steel Ingot

Mor Dhona - Spelling Me Softly (33921 XP)
Requires: 5 Raptor Leather
Raptor Leather components:
5 Earth Shard
1 Raptor Skin
1 Black Alumen