So I just beat the campaign for Halo 5 today, and did it on legendary. I did not unlock the beating campaign achievement for any difficulty at all, nothing unlocked except for completing Mission 15. That is very frustrating and annoying, seeing as how the game turned out (which is like a 2/10 for a halo game imo), and especially how difficult it was on legendary (the *** Wardens man, they're impossible if you have to defeat three of them at the same time), I was really looking forward these achievements (Lone Wolf, Legacy, Heroes Rise, and Forging a Legend), and it was stolen from me.
Yes I already looked at the sticked/announcement topic to see what I could of done. I turned my xbox one off, and on again, I redownloaded my profile, and I tried playing the last mission again, and yet it still does not unlock.
I know this is just a forums, and can't actually do anything technical, but I would like some sort of advice, or who should I contact for this issue, because beating this game on legendary is worth the G's
You can also look at this youtube video, and see that I actually did beat the game legendary on solo, but have not received my achievements.