I know I am a little behind the ball, but I just recently completed all chapters in the first 5 episodes of Spartan Ops. I believe this entitles me to the "Dedicated to Crimson" Achievement.
Dedicated to Crimson
Completed all chapters in the first 5 episodes of Spartan Ops on any difficulty.
I can look in the "Play Chapters" menu and see that all chapters are completed at Heroic or better (most via matchmaking). Why have I not received the achievement?