I'm not sure if this is exactly the same thing that others are having, but it involves the same items.
http://i.imgur.com/RL3VL.jpg -> Here you can see I have unlocked Omega Force Shadow Operative, which as a requirement has to have Omega Force Operative
http://i.imgur.com/dlJoq.jpg -> Here you can see Omega Force Operative stating that it is not complete, even though there are checkmarks for all boxes. I've completed both the costume unlock projects, but even after finishing them neither the costumes nor the accolade fixed itself.
This is happening to me as well. I noticed it after I bought the mk xii pieces I needed. I had the MACO and Omega mk XII weapons prior to season 7.