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