I recently ran the entirety of Halo CE on Legendary CO-OP in an attempt to get Helioskrill for halo 5. I completed them all and it shows as completed in MCC. However, I didn’t get the achievement or the armor. Upon inspection of my Waypoint account, it shows i have only completed some of the levels of CE on co-op. I didn’t change any of the skulls and for the most part was a nonstop play-through. I was connected to WiFi the whole time. How do i fix this?
Update: i went a replayed a few of the levels and it still says I’ve never even played them
Your only option is to replay all the levels that did mot register as complete. I noticed your times for all the completed levels are 1:40:39 which shows you guys took quite a long time per level. Try and beat the ones that didn’t save a bit faster when you replay them. Sometimes MCC doesn’t save progress if you take too long on a level.