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.
Collect all lore.
Collect all entries in the collection.
Reach max level.
Reach the "Harmonized Force" ending.
Reach all endings.
Reach the "Power of Cleasing" ending.
Reach the "Blessing of Pure Blood" ending.
Defeat any boss without using potion.
Reach the "Power of Vile Blood" ending.
Craft all potion recipes.
Finish all levels.
Unlock all plague weapons.
Defeat Urd.
Collect all story bits.
Reach the "Chaotic Power" ending.
Defeat Corvus.
Finish "Hermes Fortress" level.
Defeat Varg.
Defeat Mutated Odur.
Defeat Sound of the Abyss.
Defeat God of the Fools.
Collect all potion ingredients.
Fully upgrade a potion.
Finish "Royal Garden" level.
Defeat The Hanged Queen.
Craft a potion recipe for the first time
Fully upgrade a plague weapon for the first time.
Finish "Sea of Trees" level.
Defeat Odur.
Unlock a plague weapon for the first time.
Dead 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.