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