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