I Am the Hero

To unlock this achievement you have to defeat Mr. Pro. You will face him normally during level 2-3 of the Story Mode. He will also appear in the arena mode. Completing all the boss battles will be quickest through the campaign. Hes pretty easy, he has a cheesy move that makes you get hit by a car so be on the look for it and be sure to jump. Once hes down the achievement will pop.