I’ve bring myself to try to get the achievement that requieres you to complete Spartan Ops on legendary, and also alone. I dropped my attempts for a few months, and when I came back today, I did one mission, the Didact’s Gift or something like that, and when I finished, I noticed how they didn’t give the achievement for beating the episode, and when I checked back, the little box that tells you in which difficulty have you beat the level was blank, telling me that I haven’t completed the level at all. Is this just a bug? I did the same mission twice but I never got anything.
The in-game menu to tell you have completed a chapter & episode has been bugged for a couple of seasons, hence why the in-game menu marks it as “incomplete” whenever you finish a chapter & episode.
You can still unlock those Spartan Ops achievements, but you have to manually keep track of what chapters & episodes you’ve completed.
Can confirm it does work. I finished Legendary Solo this weekend and all the achievements popped. It just doesn’t show in-game.
Can also confirm that the achievements still unlock after attempting this while this bug was present. I manually kept track of where I was at using the notes app on my phone.