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