Any Achievement or Dead Multiplayer groups?

Hi,

Could someone recommend good groups for getting help with achievements, or playing dead multiplayer games in general?

Or maybe someone just wants to play?

I'm looking to play games like Spec Ops: The Line, Madballs: Babo Invasion, Zero Gears, Ravaged, and to get stupid achievements like those in TF2 where you need to play with a dozen friends at once.

FYI, yes I know about SAM, but don't want to use it.

Thanks for your help!