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From the FAQ on Meta Stack Exchange: List of all badges with full descriptions:
Ask a question that after its first week of existence has score of 0, no answers, no comments and no more than 60 views.
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We've been slowly backing away from using Community Wiki in most situations. That doesn't mean the badge is a bad idea. Rather, we'd want to find a way to make a badge that encourages the rather nuanced behavior we want to endorse. And that's not going to be easy. If you have some ideas about how to make a badge that does something other than cause people to ...
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If you post all of the ones that need an explanation, I will expand this answer.
That description you posted means that your answers that were accepted yet have a zero score (no votes, or upvotes and downvotes cancel out) represent 20% of your total answers. There must be more than 5 of these to get the badge.
Does that make sense?
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Well, the question was asked more than a week ago, and had no answers. Migration doesn't change the date. I think this is expected behavior.
Only top voted, non community-wiki answers of a minimum length are eligible