The newish badges for accepted answers with no upvotes are very welcome, but might I suggest that the definitions be tweaked to include zero and single-upvote accepted answers, or at least those where the single upvote is from the OP?
My reasoning is simple - it doesn't (usually) make sense to accept an answer and not upvote it. Most commonly this happens on questions posted by those new to the community. So one could take the view that there is little difference between zero and single-vote accepted answers.
It strikes me that there are probably a number of answerers helping out experienced users with obscure questions that are not being rewarded.
Edit: In the light of recent question Do negative score/accepted answers count towards tenacious/unsung hero? any new opinions on this proposal?