I’m currently completing each of the campaigns in coop splits-screen and unlocking achievements. The profile who is second in the list of players NEVER gets any stats saved! In the career appears as if the mission was not played. Also the score appear as “0” next to the second player only. I had to complete the every campaign twice in order for both profiles to unlock the achievements (I don’t mind replaying the game EVER). A few times it even happened to the first profile, having to replay the mission again. Also in the second campaign one of the final missions could not be completed in coop because the game would freeze. There was NO WAY around this, it froze every time, but never if played by one player only. There were times where the game would freeze at random intervals or simply wouldn’t start. I’ve yet to play a single match online since the day it came out even though there have been many “updates” to improve the online. I want to add I bought the XBOne just because of Halo. I have a lot of friends who are experiencing this too.
If I try to unlock The Library related achievements and they don’t pop up… I’ll die (JK… maybe) Please fix this…