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