I don’t understand why so many achievements are broken in this game. I have 100% completion for all campaigns on Legendary difficulty and yet I still am not unlocking the Legend achievement. How can a game be broken for this long after release? Here is another useless post in attempt to get 343 to actually do something about their broken game.
you might try resetting your Xbox and restarting halo. If that doesn’t work try going to the leader boards and see what mission it says you haven’t completed. You could also try doing the last mission again.
I see it in campaign achievements where it says 40/40 for Legend and have restarted my Xbox and Halo multiple times. The problem comes from 343 not unlocking it.
The issue is that the server for the achievements doesn’t recognize that you finished the game. Sadly achievements are no longer a local thing.
Did you ever get the achievement to unlock? I am having the same problem