Iron Man

Suits:
Mark 1 suit:
Complete Mission 1 to unlock Mark 1 suit.

Mark 2 suit:
Complete Mission 2 to unlock Mark 2 suit.

Mark 3 suit:
Complete Mission 4 to unlock Mark 3 suit.

Classic suit:
Complete Mission 6 to unlock Classic suit.

Classic Red and Gold suit:
Complete Mission 9 to unlock Classic Red and Gold suit.

Stealth suit:
Complete Mission 11 to unlock Stealth suit.

Titanium Man suit:
Complete Last mission to unlock Titanium Man suit.

Unlock all suits:
Complete the game on the Easy difficulty level to unlock all suits.