Portal 2 Co-op Achievements... Wanna Cuddle... What you waiting for 'Join then'...

An all-new co-op adventure starring Atlas, P-Body and GLaDOS, the free DLC "Peer Review" takes place an unknown period of time after the events of Portal 2. You and your co-op science partner are once again awoken and assembled for a dangerous new mission. Did we say "dangerous"? We meant routine. Everything's fine. That slight note of terror you're hearing in GLaDOS's voice is probably just an audio calibration error. Anyway, on with your suicide mission. And when we say "suicide mission" we mean it would be suicide not to take this mission. Because it's so safe. Everything's fine.

Downloads Automatically and its in the Co-op Hub with the rest.