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