Run Sausage Run!

The easiest way to get this is to load up multiplayer, set the rounds to 30, and put it on Panic Mode. (You get 1 life per round in this mode) It will put you against 3 bots and they are pretty bad. Most of the time they die at the beginning especially if you can get out in front early with out dying. You get 25 points per win and there are 30 rounds so as long as you can win most of your matches this achievement is really easy.