Full list of all 12 X-Men Arcade achievements worth 200 gamerscore. It takes around 2-3 hours to unlock all of the achievements on Xbox 360.
You completed the game on Expert difficulty.
You defeated Magneto with all 6 X-Men characters!
Mystique tried to fool you and five other players in a 6-player game.
You completed Level 4 without jumping.
You played in a 6-player match with five other people.
You completed the game in 25 minutes or less.
You took an energy pill.
You defeated Pyro without using any mutant powers.
You were welcomed to die by the White Queen.
You earned at least 250 points in one game.
You learned that Magneto has kidnapped Professor X.
You used a mutant power 5 times in one game.