Originally Posted by master131 View Post
Use a trainer. The missing titles/emblems was probably from a poorly coded GSC.
Well, the other day I was playing MW2 for my 360
you can't use a trainer on the 360 ^^
the only thing you can hope for is that you join a modded lobby again that let you have all challenges done.
or contact xbox support or infinityward, maybe they can help you
btw. this should be posted in the xbox 360 section ^^