ARCADE Hero Achievement
Play the 'Arcade Hero' mode 5 times (Arcade only).
From the main menu, select "Arcade" then across to "Arcade / Community" page. Now select either "Arcade Hero - Solo & Co-op’’ or ‘Arcade Hero - Multiplayer" and complete the five random maps given to you or the multiplayer game.
You have to complete the level given to you in order for it to count towards the achievement; you cannot enter and then quit. If you receive a really easy level, just replay it; it still counts towards the achievement, so you do not have to play five different maps.