So me and a friend just completed all of the campaigns on legendary. I received the achievements on all other campaigns except Halo 2. My Coop partner has gotten it but I haven’t. It says I’ve completed all missions on legendary in game, but Halo Waypoints does not. Any suggestions?
I would like to get this resolved as I do not want to replay Halo 2… and I would like my armor for Halo 5.
For me this unlocked once I played through again on legendary for the 3-Hour achievement, but if you do not have the patience to grind through the levels for that one I’d advise turning on the envy and bandana skulls to help make it easier ( it will say achievements don’t unlock, but in truth only the Score/Time ones wouldn’t unlock).
I would also recommend playing the missions Heretic and Armory once more, as these seem to be trouble makers for this achievement as well.
Good Luck!