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