Something I haven't seen in this thread yet:
Leisure Suit Larry in the Land of the Lounge Lizards - During the first missions you are told to tell someone "Ken sent me".
Currently searching for people to boost the online achievements of:
Moon Diver, Resident Evil 6 Three Mode DLC, Assassins Creed Revelations 4 Player DLC Achievements, Halo Spartan Assault multiplayer.
This list is always up to date.