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