well heres how you do it.

finish a game when u rank up or get a challenge at the end of the game reapeatedly press the back button to veiw scores and then u will see the shadowing of the challenge thing and u sometimes see some challenges like if you are playing search and destroy u get like the edge challenge in like round one u'll see it there so yea other than that its completely annoying cuz it stays till u turn off oyur xbox