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