My friend and I have been grinding out MCC to get the Halo 5 Helioskrill armor set… I helped him through CE up until TB and the rest he did on his own. I have some progress in H2 with my sister, but not much, I have a little bit of progress on H3 and I have 3 levels left for H4. However, he is done with all of them (we completed the last level that he needed today) and he didn’t get the Legend Achievement. I told him to try changing a cosmetic to update the servers, didn’t work. I told him to restart his xbox, didn’t work. I told him to open Waypoint on his xbox to sync it, didn’t work. I checked his profile on Waypoint and he’s missing the missions that he did solo in CE (all of the ones we did co-op are there) all of his H2 progress is gone (he did it solo) his H3 is complete on legendary, and he needs one more hor H4 which we realized we did actually miss in-game, but why is the rest of his progress gone? I went to check mine and all of my co-op CE progress is gone, but he still has his? I’m not sure what to do, so I came here first. If you want to cross check our service records, you can see my gt^ and his is DoggieCoffee. It might help to know that we were using bandana on CE and bandana, scarab gun, and envy on H2. If you figure anything out please let me know.