Here is the full list of all 63 ATONE: Heart of the Elder Tree achievements.
Drink the Magic Mead.
It's over. You can go home now.
Battle Freya.
Buldr and Forsetti come to Yri's aid.
Collect all the Magic Mead ingredients.
Battle Taangrisnir.
Solve the Tracked puzzle.
Solve the Stumped to Death puzzle.
Solve The Unsolvable Puzzle.
Solve the grouped puzzle.
Battle Loki.
Battle the Ice King.
Aid Blue Heart in her task.
Battle Skullhorn.
Set Eiryn on her own path.
Obtain Jörm's venom.
Return Eiryn's knife to its rightful owner.
Read 20 Story Nodes or Books.
Solve the Who Sits Where? puzzle.
Answer all of Vèldin's questions correctly.
Solve the Griddled puzzle.
Solve the Stumped Again puzzle.
Find the famous tiny shield
Save Forsetti from her fate.
Battle Heldi.
Solve the Spring puzzle.
Solve the Jumbled Freedom puzzle.
Obtain Odin's Ring from Jörm.
Solve the How Many? puzzle.
Solve the Water Runes puzzle.
Solve the Blockad puzzle.
Battle Viktor.
Solve the Jumbled Divide puzzle.
Battle Jörm.
Battle Old Man Wulf.
Find a small peice of Odin's spear
Solve the Grid puzzle.
Solve the Bloodtrack Puzzle.
Talk Sven from his Blue Vein state.
Battle Sven.
Protect the Elder Tree.
Train with Thyon.
Help Dallr tune his lute.
Sometimes sacrifice is necessary to save the world.
Goodbye little friend.
This is the end.
Obtain Mayweed from Sven.
Complete all of Isa's puzzles.
Solve the Stumped puzzle.
Solve Gulli's Puzzle.
Unlock 13 Battles.
Battle Buldr.
Battle Hati and Skol.
Carry 1250 coins.
Score 6500 points against Odin.
Score 6500 points against Dallr.
Get a 90% hit rate against Tanngrisnir in Arena.
Score more than 10,000 points on any battle.
Get a 90% hit rate on any Arena battle.
Get a 90% hit rate on at least 5 arena battles.
Get a 90% hit rate on at least 10 arena battles.
Get a 90% hit rate on at least 15 arena battles.
Fight your first Arena battle.