My friend and I were trying to do a co op cross game playlist to earn us that achievement but both times we attempted to play about 3-4 minutes into the mission the game would go into a freeze state and make that audio clashing sound. Both of our attempts were in Halo 1, once during the first cut scene when Keyes was speaking and another time my friend and I had just passed the first bunch of enemies up the beach on the silent cartographer.
Just want to add my experience and hope it helps to the overall experience. Although I really hate playing multiplayer right now, every -Yoinking!- match has unbalanced teams and it makes me a sad panda.