Acquire More Suits: Classic Suit - Finish the challenge "One Man Army vs. Mercs" Classic Mark I Suit - Finish the challenge "One Man Army vs. AIM" Classic Mark II Suit - Finish the challenge "One Man Army vs. Ten Rings" Classic Mark III Suit - Unlocked from the get-to. Extremis Suit - Finish the challenge "One Man Army vs. Maggia" Hulkbuster Suit - Finish the challenge "One Man Army vs. AIM-X" Ultimate Suit - Finish Story Mode.
