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Hi, I just completed every campaign in MCC on legendary and haven't unlocked both the "legend" achievement and the helioskrill armor. I even have proof that I did, and it is linked below. I checked waypoint and it said that I have only completed 20% of halo ce (total) 54% of halo 2 (total) and 78% of halo 3 (total) (although it says that I have completed halo 4 on legendary completely). I really do not want to replay most of the campaigns as it is literally like going to hell and back (those who have actually done all campaigns on legendary would understand). I've been working towards this around when halo 5 came out (so nearly 2 years now).

Proof: (per mission)
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013335
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013338
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013340
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013343
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013347
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013358
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013361
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013362
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013363
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013364
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013368
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013369
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013371
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013372
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013373
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013374
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013376
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013377
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013379
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013380
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013381
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013384
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013386
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013388
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013389
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013391
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013392
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013393
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013394
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013396
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013397
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013399
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013400
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013401
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013402
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013403
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013405
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013410
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013411
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013413
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013414
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013415
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013416
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013418
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013422
http://xboxdvr.com/gamer/Spartan%20Roks/screenshot/7013424
No way you can fix it. just play through the campaigns again.
Sadly they are server side achievements now so if levels didn't register as complete all you can do is replay them. My recommendations are this #1 use a wired connection for your Xbox, #2 do a hard reset before playing MCC or even H5 for that matter. #3. Make sure you watch all the cut scenes from start to finish. #4 make sure you aren't using any of the "cheat" skulls (I recommend not using any to be on the safe side.)
Dude, check out the intro missions, that happened to me in H3, even if is only cinematics
i guess its a good thing i didnt do all that work. sorry bro