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