Help with the strength in numbers achievement

[lilmike1134]

Me and a friend r trying 2 get our strength in numbers achievement. Its gonna b our hardest 1 to get because we dont game with many other people that have l4d2. we need 2 other people 2 help us with this. and we are willing 2 help with achievements also. we would prefer 2 play on friday or saturday nights, and we live on the east coast. so if nebody is interested hit me up on xbox live my GT is lilmike1134