Here is the full list of all 28 Wild Arms 3 trophies - there are 9 bronze, 13 silver, 5 gold and 1 platinum.
Unlock all trophies.
Defeat the Nega Filgaia.
Destroy the Mothership.
Defeat Ragu O Ragla for the final time.
Reach level 90 with Virginia, Clive, Jet, and Gallows.
Complete every Millennium Puzzle.
Read all 11 Adventure chapters to Kaitlyn and receive her EX File Key.
Defeat Lolithia at Mimir's Well.
Reach Migrant Level 20.
Defeat Dragna Sieg at Deus Ex Machina.
Complete each division and defeat Bad News at Gunner's Heaven.
Complete the Journeyman Division at Gunner's Heaven.
Reach level 50 with Virginia, Clive, Jet, and Gallows.
Complete the Novice Division at Gunner's Heaven.
Explore 100% of the World Map.
Win a battle using the Sandcraft's Ark Smasher weapon.
Inflict 50,000 damage with one strike.
Buy something from the Black Market.
Reach Upgrade Level 15.
Defeat Leehalt, Melody, and Malik in the final battle at Yggdrasil.
Raise every character's LCK rating to BEST.
Breed a plant in the Secret Garden.
Reach Migrant Level five.
Defeat Janus at Ka Dingel.
Upgrade an ARM attribute to level five.
Successfully disarm a treasure chest trap.
Receive your first four mediums.
Defeat Janus on the roof of the train.