Here is the full list of all 53 STAR OCEAN THE DIVINE FORCE achievements.
Defeated the all-powerful Gabriel Celeste
Laeticia and Marielle thereafter
Watched every ending
Laeticia and Theo thereafter
Laeticia and Midas thereafter
Laeticia and Malkya thereafter
Laeticia and Nina thereafter
Laeticia and Raymond, and beyond
Laeticia and Albaird thereafter
Laeticia and Elena thereafter
Beat the game on Chaos difficulty
Clear 55 quests or more
Defeated over 3,000 foes
Raymond and J.J. thereafter
Launched 100 Surprise Attacks
Found every mini-bunny
Raymond and Laeticia, and beyond
Raymond and Malkya thereafter
Raymond and Marielle thereafter
Raymond and Nina thereafter
Raymond and Midas thereafter
Raymond and Elena thereafter
Raymond and Albaird thereafter
Won a game of Es'owa for the first time
Beat the game on Universe difficulty
Saved the cosmos from peril
Basked in the light of hope
Used Item Creation for the first time
Peered into the darkness of the Pangalactic Federation
Walked over 100 km
Arrived in Parrapoeiam
Depart from Aster at last
Allowed Emperor Bohld'or to escape
Burst into the wedding and carried out the rescue
Tomorrow is the day to launch a major operation
Laeticia said “yes”
Reunited with friends
Arrived at the Ancient Coil
Surprisingly endured a crushing defeat in Baldaar
Found Dillwhip
Met Theo in the town of Cotto
Recruited Midas to join your party
Entered the village of Eda after a rough welcome
Recruited Nina to join your party
Defeated the colossus of the Mhedume Ruins
Complete at least 90% of the Bestiary
Performed 200 Blindsides
Flew over 100 km
Obtain at least 90% of all weapons
Opened all treasure chests in the universe
Acquired the rank of Battle God
Defeated the mighty Ethereal Queen
Make at least 90% of all items in Item Creation