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