Iron Man Cheats for PS3

Infinete Ammo:R2+L2+R3+Triangle+Square
Infinite Health:L2+R2+X+X+Square
Gun_PSG1:X+X+SQUARE+R2
Gun_M16Grenade Launcher:R2+R2+X+R3+L3
Gun_AK74Greanade Launcher:L2+L2+X+R3+L3

spin in a circle with the boost on then go to the enemy and uni beam him ........ instant kill!

If you want to unlock the different versions of Tony Starks Iron Man armour you must play Story mode to unlock 'One Man Army' missions. Completing 'One Man Army' missions will unlock a version of the Iron Man armour which can be used in further 'One Man Army' missions and completed missions in 'Mission Archive' mode.
Unlock Mark II Armour:
Complete the 'One Man Army vs. Ten Rings' mission which is unlocked after Story mode mission 3 (Stark Weapons).
Unlock Extremis Armour:
Complete the 'One Man Army vs. Maggia' mission which is unlocked after Story mode mission 4 (Maggia Factories).
Unlock Classic Armour:
Complete the 'One Man Army vs. Mercs' mission which is unlocked after Story mode mission 7 (Arctic Battle).
Unlock Classic Mark Armour:
Complete the 'One Man Army vs. AIM' mission which is unlocked after Story mode mission 8 (Lost Destroyer).
Unlock Hulkbuster Armour:
Complete the 'One Man Army vs. AIM-X' mission.
Unlock Silver Centurion Armour:
Complete the game