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 story bits.
Collect all lore.
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 "Blessing of Pure Blood" ending.
Finish all levels.
Unlock all plague weapons.
Defeat any boss without using potion.
Defeat Urd.
Reach the "Power of Vile Blood" ending.
Defeat Corvus.
Finish "Hermes Fortress" level.
Defeat Varg.
Defeat Sound of the Abyss.
Fully upgrade a potion.
Finish "Royal Garden" level.
Defeat The Hanged Queen.
Defeat Mutated Odur.
Fully upgrade a plague weapon for the first time.
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.