On the Area51 site, there's a Civic Duty badge, which has the same requirement of 300 votes as on the other SE sites. Some people (46 as of today) have event been awarded it, so it does exist!
However, I can't seem to find out how many times I've voted to know how close I'm doing. My profile info doesn't show the voting counts, only voting on questions I've proposed. I can track Not A Good Example via the reputation tab (they show up as a red zero, I think a recent change), but the rest don't show anywhere.
As I understand it, the usual answer in the case of "How close am I to this badge" is to perform a query against the data explorer once a month. Unfortunately, Area51 isn't available on the data explorer, and I've just been told that this can't be changed any time soon due to schema differences.
So, in the absence of a data explorer, any chance there could be a new feature to allow a user to track their Area51 voting?