I have recently reached Black belt with a 55% win ratio, but I have not as yet recieved the Prodigy Achievement.
I do know that the usercards/achievements generally just take time to update, but I have looked around for similar threads and it seems that the only way for it to be fixed is manually by a person with TSA access or something like that
The Achievements are really really buggy, and are not even close to complete. I do believe that the only working achievements are the Band Aid and the Belts.