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