Alright everyone listen up.
Achievements in MCC: Multiplayer AND Campaign does not unlock.
Speedrun / Score in campaigns is not updating or beeing recorded.
Online Multiplayer Scores, wins ect ect. Is not recorded.
So if any of you want to play, you play to get nothing.
Challenges for some reason do work.
Halo Wars 2 does not grant achievements right now either.
343 is well aware that there is a problem - they are looking into it right now.