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