This achievement is pretty easy to get but you should note one thing before going for it. It does NOT work in private matches (or ranked - thanks to Bahaumaut for pointing this out), as those do not count as "classic" games because they are editable. Just tried this and it did not pop. If you are boosting (which you should since no one is online anymore), I suggest having one player create a player match (not ranked) and the other person just search for it. Then just have one person kill themselves (run into the tank, spider, light cycle, etc.). The game will automatically end when someone dies IF they are already losing. So you do not need to worry about continuing to play. Just have more points than the other person, and you will win.
Also, this supposedly works on VS., VS. Speed Mode, and Pressure Cooker.