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