Halo 3 ODST Help!!!!!!!!?

Im am looking for 3 partners to play Halo ODST with for achivenments. I'm looking to get Vidmaster Challenge Endure, Vidmaster Challenge Deja Vu, and all of the ones attached to firefight mode. If you can help, leave your gamertag, and add me as a friend on LIVE. My gamertag is N4D34U. I need all the help I can get!