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