Please help with Halo 3 legendary

Hello, everyone I'm on a goal to get all the achievments for halo 3. To do that I need to beat legendary, so I could use a little help from 1 or 2 people. I've done most of legendary already, but I stillneed the following levels...

The Covenat, Cortana and Halo.

I would very must appriateat as much help as I can get and if your not going to play the whole level, please dont bother. Thankyou.

My gamertag is:ZeroXin, add me or post here

At the minute I only have time for 1 level, I have to go in about 40 minutes. So maby later on or tommarro.

I'd love to play with you but my intertet sucks for Campaing Co Op, sorry Xp

I'd love to play with you but my intertet sucks for Campaing Co Op, sorry Xp

xfan-atic

Np bro, thanks anyways. Everyone I have to go to some party bbl