Missing a good portion of mine as well. Perplexing. I have Marathon Durandal, Halo 2, Halo 3, Halo 3 ODST, and Halo Reach all played on my Xbox Live Account which is linked to my Bnet profile, and still didn't even get The Inner Chamber. Disappointing, was looking forward to it. I suppose they're just emblems, but I hope that the issue will get resolved for the community (including myself :/)