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