At the end of chapter 15 you will have to survive a few waves of necomorphs and soldiers. When the two enemies on the scaffold show up with their rocket launchers this is your perfect moment to unlock the payback achievement. Just grab one of the rockets and send it back with you kineses. All gameplay was captured with the Elgato Game Capture HD. [subscribe]GamrInsanity[/subscribe] http://www.youtube.com/watch?v=uFtYxj6_HkQ&hd=1