Some of the Area 51 badges have not been achieved by anyone but I wonder if Great Question is achieveable?
I presume the current definition is simply a takeover from the existing Q&As, like Meta StackOverflow. But I think it should be different on Area 51.
The Great Question badge requires 100 votes. But most people stop after 20 because that is the threshold to get an on or off topic question and people want to get their Q&A through the definition phase.
I don't think I've seen a question get near 100 votes - has anyone seen an example of that?
Update: based on the data provided by Emmett below, I thought the Good Question badge may be unachieveable (it requires 50 votes). However, 15 people have achieved it. On closer examination, this looks like a database issue.
Take Joel Spolsky's best question, Statistical Analysis: Joe is 8 years old, Mike is 10 years old, and Alice is 13. What is their MEDIAN age? This has 1 on topic vote and 22 off-topic. I make that 23. So how did he get the Good Question badge?!
Update 2: Removed the bug tag - it referred to the Good Question problem (people got it without having 50 votes - this was done during the setup / test phase of Area 51, see below comments).
Final Update: Please see also my related (follow-up) question here: Why not replace Good & Great Question badges with a Top 5 badge?
Twenty months later: it is still not achieved. Will you reconsider the implementation?
Finally: after the new implementation, one person has got this badge!