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