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