I didn't get an email, I've scanned my spam folders etc and no dice. I have been getting other things so..who knows.
So...what to do? go to the help center. Search for "badge challenge". You can find a button to do your survey for December there.
I should have 10 badges plus the one for doing 10 challenges. But if I ever want to win anything around here, obviously I'll have to forget the editing and go sub and seg.