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