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