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