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