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