Here is the full list of all 38 Thymesia achievements.
Empty the first health bar of Varg in the tutorial.
Unlock all achievements.
Break 1000 barrels.
Reach max level.
Collect all entries in the collection.
Collect all lore.
Defeat any boss without using potion.
Craft all potion recipes.
Collect all potion ingredients.
Craft a potion recipe for the first time
Reach the "Chaotic Power" ending.
Reach all endings.
Reach the "Power of Cleasing" ending.
Reach the "Harmonized Force" ending.
Reach the "Power of Vile Blood" ending.
Reach the "Blessing of Pure Blood" ending.
Finish all levels.
Defeat Corvus.
Collect all story bits.
Defeat Urd.
Unlock all plague weapons.
Fully upgrade a plague weapon for the first time.
Finish "Hermes Fortress" level.
Defeat Varg.
Defeat Mutated Odur.
Defeat God of the Fools.
Defeat Sound of the Abyss.
Fully upgrade a potion.
Finish "Royal Garden" level.
Defeat The Hanged Queen.
Finish "Sea of Trees" level.
Defeat Odur.
Unlock a plague weapon for the first time.
Dead for the first time.
Start recalling for the first time.
Finish the tutorial.
Rest at the beacon for the first time.
Reave a plague weapon for the first time.