Here is the full list of all 30 Arietta of Spirits achievements.
Complete the game.
Escape from the Sunken Realm.
Defeat the Sunken Behemoth.
Help Minerva cross over to the afterlife.
Harvest all vegetables from the garden.
Complete the Journal.
Defeat the Roamer Behemoth.
Unlock the Medium Roamer Core.
Unlock the Small Roamer Core.
Ladders finally fixed.
Kill a butterfly.
Pick blueberries for Mom.
Defeat the Cloaked Roamer.
Find Gibb's workshop.
Unlock the Spirit Shield.
Obtain the Herbicide.
Defeat the Spikeroot Roamer.
Find Minerva's hut.
Help out Father in a sticky situation.
Get to keep Grandma's Silver Ring.
Defeat the Huge Roamer.
Obtain the Spirit Sword.
Become a Bound.
Find Grandma's portrait.
Defeat the Wasp Queen.
Obtain the Wooden Sword.
Find all of Midri's goods.
Find all lost Spirit Cubs.
Unlock the Large Roamer Core.
Complete the game on Extreme Mode.