My friend and I played through the entire campaign of Halo: CE on Legendary even through all of the terrible connectivity issues. Finally we get to the last level, The Maw, beat it and it DISCONNECTS him right after the final cutscene so he gets none of the achievements or rewards, and I still got them all but it says I played the level on solo. Then I was able to convince him to replay The Maw again today… SAME PROBLEM! It disconnected him right after the final cutscene and he STILL did not get the achievements or rewards for beating the game! This is absolutely a disgrace and he now says that he is returning the game so thanks 343 for the wonderful multiplayer co-op experience that infuriated my friend so much that he is returning the game.
Thanks