I wonder what the "Select your next badge" popup looks like when you've got all the badges listed there...
It will be empty. See the user profile of the user templatetypedef on Stack Overflow. (S)he is most likely the only such user on the network, since I checked all users with the Illuminator badge (this might be outdated). The honourable mention goes to alecxe, who only needs the Peer Pressure badge, which is very hard to get if you only post good answers.
Of course, we do not know for certain whether they don't see a dancing unicorn.
I also think it is disappointing that the Socratic counter doesn't show, say, 143/200, since you can earn the Socratic badge multiple times and it normally shows up in the next badge section.