Here is the full list of all 34 Metal Slug XX trophies - there are 22 bronze, 6 silver, 5 gold and 1 platinum.
Clear a mission with all Ikari members.
Clear a mission with all Regular Army members.
Reach Rank 1st RECORD TIME on HARD difficulty. Must play through all stages without quitting game.
Finish the game on Difficulty HARD (Must play through all stages).
Play the Combat School survival mission.
Reach Rank 1st RECORD TIME on NORMAL difficulty. Must play through all stages without quitting game.
Clear all 3 hidden paths.
Free all POWs in any mission.
Let a chicken hatch, grow, lay an egg and see a new chick hatch.
Defeat 10 enemies with POW Hyakutaro's energy balls.
Shoot down 20 UFOs with the Laser beam.
Defeat 40 future soldiers with the Zantetsu sword.
Trigger the 100 Morden Soldiers encounter in Mission 2.
As Eri, kill 10 enemy soldiers at the same time with grenades.
Throw 30 enemies with Clark's Special Action.
Destroy 30 vehicles with Ralf's Special Action.
Destroy 5 Slug vehicles with Tarma's Special Action.
Defeat 30 enemies with Marco's "Punching Glove" Special Action.
Reach Rank 1st RECORD TIME on BEGINNER difficulty. Must play through all stages without quitting game.
Clear the game within 45 minutes. Must play through all stages without quitting game.
Get the rare gem item.
Defeat Rebel Gigant with at least half life (Mission 6's boss).
Get in all Slug vehicles.
Rescue Rumi Aikawa.
Collect 500 coins.
Nullify 100 enemy projectiles with Leona Heidern's Special Action.
Defeat The Union's parts in a specific order (Mission 5's boss).
Find the Old Man.
Collect the doll item.
Unlock all trophies.
Clear all Target Elimination missions with Rank A or above.
Clear all Base Assault missions with Rank A or above.
Clear all POW Rescue missions with Rank A or above.
Clear all Special Training missions with Rank A or above.