halo 3 multiplayer achivements

hi i want to get some halo 3 achivements so how im gonna do this is if you want to join message me at my gamer tag TheFinalMster and when i get enough pepole i will send out party invites so i need basicly every multiplayer achivement and i can help with all of them as i have the ODST disc
PS dont send a friend request a message will do
PPS you need a mic
PPPS and all the DLC’s or the ODST disk