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