Snow Iceman, Brown & Gold Wolverine, Original and 70's Cyclops, Original and 70's Jean, 70's Nightcrawler, Colossus, & Storm= Complete Act I
Age of Apocalypse Costumes & original Scarlet Witch costume= Complete Act II
Civilian costume for Storm, Cyclops, & Wolverine Complete Act III
Dark Phoenix= Beat the Game on any difficulty level
Cable= Beat the "X-cutioner's Song" playable comic mission
Cannonball= Beat the "Brood: Day of Wrath" playable comic mission
Beat the game on any difficulty level.
To unlock Iron Man you must first collect four homing beacons from each act, then go to the "home" location. There will be a portal there, enter it and fight your way through to one of Iron Man's items. When you collect all of them you unlock Iron Man.
Beat all the danger room missions.
Find the Age Of Apocalypse comic.
In the Review Menu: Right, Left, Left, Right, Up, Up, Right, Start= All comic books
In the Review Menu: Left, Right, Right, Left, Down, Down, Left, Start= Unlock all game cinematics
At team management screen: Left, Right, Left, Right, Down, Up, Start= Unlock all skills
At team management screen: Right, Left, Left, Right, Up, Up, Up, Start= All Characters
At team management screen: Up, Down, Up, Down, Left, Up, Left, Right, Start= Level 99 Characters
At forge or beast's equipment screen: Up, Up, Up, Down, Right, Right, Start= 100,000 techbits
In the pause menu: Left, Down, Right, Down, Up, Up, Down, Up Start= Unlimited XTreme Power
In the pause menu: Up, Up, Up, Down, Up, Down, Start Super Speed