So I just beat the campaign of halo 2 on legendary and the achievement isn’t unlocking. The progress bar on the achievement screen is stuck at 92% even though all of the levels on the mission select screen confirm that I have beaten them all on legendary. Please help this took me a while to do would appreciate the achievement for it.
Hey OP, looks like Uprising from Halo 2 hasn’t been recorded on your service record. This is a super easy one to speedrun, only takes 3 or 4 minutes at most. Try having scoring or time recording turned on and run it again. You can check here to see if it recorded properly 
ok thanks I’ll try that
ya. You can check the leader boards in the game to see what it recorded or try waypoint. But ultimately a mission isn’t recorded, and that goes for all games.