If you absolutely cannot find anyone to do this achievement with (since the game is pretty dead), it's possible to do it on your own with a second controller, though it's a much lengthier process.
The way you do this is to create a new local Xbox account with the name 'hippieman', the username of one of the developers of the port. As soon as you boot up the game with that account, the achievement will be unlocked immediately. This was confirmed by hippieman himself in a reddit post.
After that you're going to want to upgrade the local account to an Xbox Live Gold account (a 2 day trial will work). Once that's done, boot up the game and sign into both the dummy account with the achievement and your personal account. Start a private match over Xbox Live with whatever settings you choose. Simply play out the match by killing the idle dummy account. After the match ends, the achievement should unlock on your account!
I initially tried doing it locally, but it didn't unlock, so it must be done over Xbox Live. It's all a very long process but it works if you can't find anyone to get the achievement from.