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