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