<p>The newish badges for accepted answers with no upvotes are very welcome, but might I suggest that the definitions be tweaked to include zero <em>and</em> single-upvote accepted answers, or at least those where the single upvote is from the OP?</p>

<p>My reasoning is simple - it doesn't (usually) make sense to accept an answer and <em>not</em> 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.</p>

<p>It strikes me that there are probably a number of answerers helping out experienced users with obscure questions that are not being rewarded.</p>

<p><em>Edit:</em> In the light of recent question <a href="http://meta.stackexchange.com/questions/97937/do-negative-score-accepted-answers-count-towards-tenacious-unsung-hero">Do negative score/accepted answers count towards tenacious/unsung hero?</a>  any new opinions on this proposal?</p>