Here is the full list of all 51 Disgaea 4: A Promise Unforgotten trophies - there are 42 bronze, 5 silver, 3 gold and 1 platinum.
Complete all other trophies. You have obtained all the trophies.
Watch all of the special skills.
Defeat God (self-proclaimed) and watch the ending.
Collect all of the Pirate Ship parts.
All ranks of all job and monster classes can be created through Character Creation.
Increase an item up to LV 300.
Collect all items (excluding grades). Now aim for completing all the grades, too!
Clear all of the X-Dimension maps.
Inflict 10,000,000,000 damage.
Defeat Pringer X: Roar in the Land of Carnage.
Visit the Land of Carnage.
Unlock all Evil Symbols.
Train an ally up to LV 9999.
Defeat Prinny Kurtis in the Post-Game and make him an ally.
Defeat Zetta in the Post-Game and make him an ally.
Open all chests at the base from Episode 1 to Post-Game.
Defeat Asagi in the Post-Game and make her an ally.
Defeat Laharl in the Post-Game and make him an ally.
Conduct your first Reverse Pirating.
Defeat Etna in the Post-Game and make her an ally.
Inflict 100,000 damage.
Max out the Rosen Queen Company customer level.
Defeat Raspberyl in the Post-Game and make her an ally.
Get over 100,000,000 HL.
Defeat Archangel Flonne in the Post-Game and make her an ally.
Defeat Axel in the Post-Game and make him an ally.
Enforce discipline 100 times.
Watch Emizel's epilogue.
Watch Desco's epilogue.
Watch Fuka's epilogue.
Watch Artina's epilogue.
Clear the main game and unlock the Post-Game.
Watch Fenrich's epilogue.
Persuade by force three times. Demons should always resort to violence!
Defeat 100 Pirate Crew members in the Item World.
Steal 10 Rare and/or Legendary items.
Clear up to Episode 7 in the main story.
Accidentally destroy Axel's statue in the Mystery Room.
Explode ten Prinnies in a row.
Conduct your first Map Edit.
Open 100 treasure chests.
Reincarnate for the first time.
Clear up to Episode 3 in the main story.
Clear 30 floors in the Item World.
Give 50 bribes.
Get a Game Over from having your party get defeated.
Throw and capture an enemy character in the base panel.
Fight five battles with the "Classic" display option. Pixels still rock!
Defeat an ally character.
Cancel 1,000 battle actions.
Watch the opening anime. Enjoy Disgaea 4!