Here is the full list of all 38 Thymesia achievements.
Break 1000 barrels.
Unlock all achievements.
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 lore.
Craft all potion recipes.
Collect all potion ingredients.
Reach the "Harmonized Force" ending.
Reach all endings.
Reach the "Power of Cleasing" ending.
Reach the "Chaotic Power" ending.
Reach the "Blessing of Pure Blood" ending.
Finish all levels.
Reach the "Power of Vile Blood" ending.
Collect all story bits.
Defeat Corvus.
Unlock all plague weapons.
Defeat Urd.
Finish "Hermes Fortress" level.
Defeat Varg.
Fully upgrade a potion.
Defeat Sound of the Abyss.
Fully upgrade a plague weapon for the first time.
Finish "Royal Garden" level.
Defeat The Hanged Queen.
Craft a potion recipe for the first time
Defeat Mutated Odur.
Defeat God of the Fools.
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.