Party Animals

To obtain this achievement, you must complete a game by going into "quick match" and selecting "start match". Before doing this, you can invite a friend to play using the "invite friends" option that is also under Quick Play, but playing with a friend is not necessary. Once you have completed the game, win or lose, it'll take you to a "podium" screen showing all of the players where you can run around and attack one another. The quickest way I've found to knock out another character is to use a drop kick, which you do by jumping (Y on Xbox remote), then pressing the kick button (A on xbox remote), or to use the running punch. You do this by holding LT, your left trigger, to run, then pressing the punch button (X on Xbox remote).