So I decided to do a legendary solo play through of the whole series starting with Reach. I played through the whole game and completed the Pillar of Autumn, the epilogue and Lone Wolf loaded and I played them as well. Once I was finished, I went to start CE, but then I noticed it… MCC said I had completed 11/12 missions for Reach. When I went and looked it said the Pillar of Autumn was unplayed… So I did what any reasonable person would do and just played the whole mission again. Annnnnnnddd again it still says I haven’t completed it. Soooooo how am I supposed to get the frickin Monument to All my Sins achievement if it won’t even record the completion of the mission???