Last time I entered the world I received both Numismatizer, Dragon Class and Gryphon Class badges at the same time.
Fairly sure I'd only done my 11 day stretch for the Gryphon Class badge. Happy to get the Dragon but really don't think I earned it!
Please check my profile for last two badges and dates earned. Can't see any valid way they could be awarded at the same time when Dragon Class badge required an additional six days of consecutive game play.