Unlockables:
Suits – complete the indicated tasks:
Mark II suit: One Man Army mission 1 (vs. Ten Rings), which is unlocked after Story mode mission 3 (Stark Weapons).
Extremis suit: One Man Army mission 2 (vs. Maggia), which is unlocked after Story mode mission 4 (Maggia Factories). The suit has a stealth capability and has a shockwave attack instead of grenades or missiles.
Classic suit: One Man Army mission 3 (vs. Mercs), which is unlocked after Story mode mission 7 (Arctic Battle).
Classic Mark I suit: One Man Army Mission 4 (vs. AIM), which is unlocked after Story mode mission 8 (Lost Destroyer).
Hulkbuster suit: One Man Army 5 (vs. AIM-X), which is unlocked after Story mode mission AIM-X. Hulkbuster is slow but can sustain massive amounts of damage.
Ultimate suit: Complete the game.