I need help

So I beat all the halo campaign on mcc on legendary and I did not get the hilos skrill armor is there something that I have to do on waypoint?

Hey No it’s a glitch with the game try changing armor on MCC play a multiplayer game come back to halo 5 and do the same also hard reset the Xbox doing those seem to fix it for everyone if you still don’t receive wait 24 hours and check again. If it works let me know it’s worked for everyone else that I’ve told to do that.

Do I need the achievement?

Yeah you do need the legendary achievement for MCC