I happened to come across this question. I also noticed that the user who posted the top answer for this question, has been awarded "Enlightened" badge for his answer.
What baffles me is, the Enlightened badge is awarded to the user for an answer with 10 upvotes (if it is the first answer). But his answer has only 8 upvotes. Also, if you have privilege to see the upvotes and downvotes for a particular question/answer you can see that this answer has no downvotes, which implies that at no point in time that answer had 10 upvotes. So how can the Enlightened badge be awarded?
Please note that I am not criticizing or taking any objection on anyone. This is just a question which I could not find answer by myself. May be I did not understand the explanation of Enlightened badge?