Here is the full list of all 51 KINGDOM HEARTS II FINAL MIX trophies - there are 40 bronze, 8 silver, 2 gold and 1 platinum.
Clear the game and watch the ending sequence.
Win the Cerberus Paradox Cup.
Win the Pain and Panic Paradox Cup.
Win the Goddess of Fate Cup.
Win the Titan Cup.
Complete all Puzzles in Jiminy's Journal.
Collect all Ansem Reports in Jiminy's Journal.
Collect all Maps in Jiminy's Journal.
Reunite with Riku and Kairi.
Collect all Nobody entries in Jiminy's Journal.
Complete the Twilight Town episodes.
Complete the Space Paranoids episodes.
Complete the 100 Acre Wood episode.
Win the Cerberus Cup.
Complete the Atlantica episodes.
Complete the Pride Lands episodes.
Obtain an S rank on a gummi ship mission for all routes.
Complete the Halloween Town episodes.
Complete the Agrabah episodes.
Complete the Port Royal episodes.
Complete the Olympus Coliseum episodes.
Complete the Beast's Castle episodes.
Get rescued by the King.
Complete the Land of Dragons episodes.
Win by obtaining all of the opponent's orbs.
Win the Pain and Panic Cup.
Complete the Timeless River episode.
Obtain an S rank on a gummi ship mission.
Complete Roxas's episode.
Obtain all trophies.
Clear game on Critical.
Clear game on Proud Mode or a higher difficulty level.
Get Sora to Level 99.
Defeat the Lingering Will.
Defeat Sephiroth.
Defeat all Organization XIII Replica Data.
Satisfy every member of Mushroom XIII.
Win the Titan Paradox Cup.
Win the Hades Paradox Cup.
Collect all Character entries in Jiminy's Journal.
Collect all Heartless entries in Jiminy's Journal.
Collect all Treasures in Jiminy's Journal.
Collect all Mission entries in Jiminy's Journal.
Collect all Minigame entries in Jiminy's Journal.
Collect all Limit entries in Jiminy's Journal.
Collect all Synthesis Note entries in Jiminy's Journal.
Collect all Character Link entries in Jiminy's Journal.
Obtain 5,000 points with skateboard tricks.
Activate Antiform 13 times.
Obtain an S rank on a gummi ship EX mission for all routes.
Obtain all blueprints.