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