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