I was playing with a buddy on Halo 2 and trying to do it on legendary today and we spent 6 hours doing a bunch of missions and none of them actually counted for him so he didn’t get any progress on the achievement while it did count for me this isn’t the only time this has happened while once before we were doing halo 1 we did the entire campaign and only some segments of what we did actually worked the difference between these two incidents was that with the halo 1 not only was I at his place while we were doing it and the fact that it said it counted in the actually campaign section while it said it didn’t in the achievement section and with the halo 2 it said that he hadn’t done it at all with any of the missions we did today and I was also at my place and I was just wondering if anybody knew anything about this?