How do I get the Vidmaster: Annual Achievement on Halo 3?

[ben l]

I already know that I have to play on 4-player co-op on the final mission on Legendary, on Xbox live, without the warthhog and on Ghosts with Iron skull on. How do I find other players to do it with me. I don't have alot of LIVE friends, so that not an option. Is there a way to invite other online players who are not my friends to play the level? If so how and explain how to do the same thing on ODST Firefight?

 

[TIM]

just invite people to be your friends, and inform them that you want to get the achievement. or you can just play with one friend and you both have a guest - i think that works