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