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 "Power of Cleasing" ending.
Reach all endings.
Reach the "Chaotic Power" ending.
Reach the "Harmonized Force" ending.
Defeat any boss without using potion.
Collect all entries in the collection.
Collect all lore.
Reach the "Blessing of Pure Blood" ending.
Reach the "Power of Vile Blood" ending.
Finish all levels.
Defeat Corvus.
Craft all potion recipes.
Collect all potion ingredients.
Collect all story bits.
Unlock all plague weapons.
Defeat Sound of the Abyss.
Defeat Mutated Odur.
Defeat God of the Fools.
Defeat Urd.
Finish "Hermes Fortress" level.
Defeat Varg.
Break 1000 barrels.
Fully upgrade a plague weapon for the first time.
Fully upgrade a potion.
Craft a potion recipe 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.