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