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