Halo 4 completion error!!!!

Hey guys, I’m not sure how many people have experienced this problem, or if 343 is hard at work fixing it, but I completed Halo 4’s campaign on Legendary with a friend and didn’t receive the achievements for it, or the special ending. On my service record it clearly states I’ve completed 8 missions on Legendary, but for some reason the five missions after prologue are locked, but the four after are not. So to reiterate, I completed the Campaign with a friend, in a little more than 9 hours and didn’t receive rewards. I’ve contacted Microsoft support, and they’ve said to post on here. I would appreciate feedback, and any advice, but most importantly a solution to the problem. Thanks.

I slightly had the same problem, difference is, I completed it solo legendary, and the mission “Shutdowm” shows as incomplete.

Make sure you completed the whole campaign all in one run, as in, you didn’t change the difficulty in between the missions, I don’t know for sure if adding the skulls has anything to do with it, maybe. If you didn’t do any of those, then I have nothing else to provide, lol. Sorry and hope you figure it out!

Actually now that I think of it, I added the thunderstorm skull half way though to unlock some challenges, but I never changed the difficulty at all. Weird?