Here is the full list of all 38 Thymesia achievements.
Unlock all achievements.
Break 1000 barrels.
Reach max level.
Reach the "Chaotic Power" ending.
Reach all endings.
Reach the "Harmonized Force" ending.
Reach the "Blessing of Pure Blood" ending.
Reach the "Power of Vile Blood" ending.
Reach the "Power of Cleasing" ending.
Finish all levels.
Defeat Corvus.
Collect all lore.
Collect all entries in the collection.
Craft all potion recipes.
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.
Fully upgrade a plague weapon for the first time.
Craft a potion recipe for the first time
Finish "Royal Garden" level.
Defeat The Hanged Queen.
Fully upgrade a potion.
Defeat Mutated Odur.
Defeat God of the Fools.
Finish "Sea of Trees" level.
Defeat Odur.
Unlock a plague weapon for the first time.
Empty the first health bar of Varg in the tutorial.
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.