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