No matter the skulls, the graphics, solo or co-op Gravemind crashes . It’s preventing me from getting the anger skull which is the last one I need 
I’m on the OG xbox-one
Have you tried reinstalling the game?
I second the reinstall of at least Halo 2. I believe you can do that by going to Settings (within MCC) -> ‘manage your installation’ or something like that.
It should let you Uninstall Halo 2, while keeping the rest of your currently installed games to save you some time. Just re-install Halo 2 after the uninstall