Here is the full list of all 22 Rave Heart achievements.
Opened a password protected chest.
Has gathered all available party members.
Ellemine has sensed the pain of the animals.
Talked to Brittany until she becomes creepy.
Defeated the Dojo warriors in Haden.
Bryan clearly told you to get to the Warehouse!
Checked on the High King at the State Room before getting Ellemine.
Checked on the Prince at his room before getting Ellemine.
Ellemine checked on the Queen at the Master's bedroom.
Accidentally got acquainted with a mysterious astral entity.
Saved Halder City from the A.I invasion!
Helped the Farseen find their new home.
Finished the Mercenery quest with Milo.
Has collected all artifacts and defeated all of the artifact boss battles.
Defeated Vorakia and completed the main quest of Rave Heart.
Bribed the Palace Guard with a Star Leaf.
Finished all of the Inquiries available at Opalius Village.
Discovered the ATLAS Wardrobe.
Finished the Ghost Town of Grava quest.
Won as a 6 man team at Dorado's Colosseum.
Defeated Eryn.
Defeated the Lord of the Unknown.