Halo 2 shows 15 of 15 missions completed on legendary. The achievement shows 11 of 13 completed. How do I fix that? Btw, I got the Demon achievement for not dying on any champaign level. That’s got to be wrong. I’m playing it on legendary level. I die a lot! Lol. Again, how do I fix the legendary completion achievement for Halo 2. Will it fix itself on an update?
Goto your MCC service record and set your campaign to Halo 2 and see if they all show legendary completion. If they all show complete, give the achievement time as it is the Xbox 1’s achievement system just being a pain.