Additionally, there are 25 secret achievements.

Achievement	How to unlock
Battle Hardened ( 15 points )	Win 20 Arcade mode Levels.
Battle Tested ( 5 points )	Win 1 Arcade mode Level.
Comic God ( 15 points )	Answer 20 Trivia questions correctly in a row.
Dressed for Success ( 45 points )	Unlocked all the outfits for every hero.
Excelsior! ( 50 points )	Complete Marvel: Ultimate Alliance in Hard mode.
Fall to Death ( 10 points )	Threw 5 enemies off a ledge.
Fledgling Super Hero ( 5 points )	Defeated 10 enemies.
Golden Age of Comics ( 30 points )	Attained Gold on all Comic missions.
Good Samaritan ( 20 points )	Completed Skrull Cityscape level without defeating a single enemy.
I Have A Friend ( 5 points )	Complete a level with at least one other player.
Legendary Super Hero ( 15 points )	Defeated 100 enemies.
Mad Skillz ( 30 points )	Win 3 Arcade mode levels consecutively.
Marvel Geek ( 5 points )	Answer 15 Trivia questions correctly.
Marvel Master ( 10 points )	Answer 150 Trivia questions correctly.
Melee Master ( 15 points )	Performed 50 Finishing Moves.
Pugilist ( 5 points )	Performed 5 Finishing Moves.
Scared of Heights ( 20 points )	Throw 50 enemies off a ledge.
Super Hero Team ( 15 points )	Complete 25 levels with at least one other player.
Teamwork ( 5 points )	Complete one level with three other players.
Teh Mast3r ( 25 points )	Win 15 Arcade mode levels consecutively.
The Destroyer ( 25 points )	Win 100 Arcade mode levels.
The Ultimate Super Hero ( 50 points )	Defeated 4,000 enemies.
Touch of Death ( 30 points )	Performed 200 Finishing Moves.
Ultimate Team Alliance ( 15 points)	Complete 25 levels with three other players.
Widowmaker ( 30 points )	Throw 500 enemies off a ledge.