So not once,not twice, but three times now I have completed all of the Spartan ops missions on legendary, and each time its erased the minute i leave the Spartan ops, leaving them uncompleted .What’s up with that??
I have the same issue and I’ve even got the achievement…My challenge won’t unlock either…this is very irritating!
Challenge wise it is probably because they’re having issues with the server which means that you can’t complete challenges until the server comes back online. It was down the last time I’m on. So forgive me it’s back up now.