Right after you get out of the elevator and enter the building lobby in Episode 2, you’ll face off against three Ratz. These are the small, gray monsters that look a little bit like spiders. Make sure that your hands are empty and then switch to first-person view by pressing
. Then, just run up to the Ratz and pull
to kick them. Kicking doesn’t hurt them, so you can keep kicking the three in the lobby until the achievement unlocks. If you miss your chance here, don't worry -- there are dozens of opportunities to get this achievement throughout the rest of the game.