I think this is largely covered by the "Unsung Hero" badge.
I'm pretty sure anyone who earns "Unsung Hero" is likely to earn "Lone Wolf" as well, so it seems a bit pointless: the goals have quite a bit of overlap and are really not something to strive for. Something to be proud of? Sure - but not something to actively seek.
In theory: The badge would reward users who answer in these less popular tags.
In practice, it could prevent users (read: Badge Hunters) from answering in popular tags, which is not really the kind of behavior to encourage. People are already exhibiting undesirable behavior to get Unsung Hero, like deleting good answers and asking people not to upvote them.
Users trying to earn this badge will:
- Avoid questions with over 10 views.
- Be less apt to retag questions with the appropriate popular tags if applicable, to keep them out of the limelight
It's a bit silly that we have to dance around users who prize badges and rep so highly that it makes them behave differently, but That's Just The Way It Is.
IMO, if we need another badge - this one is not it.
EDIT: I do like the idea of encouragement to answer low-visibility tags, so maybe this just needs some tweaking. For instance, with only this criteria:
Got 30 accepted answers on questions viewed less than 10 times.
This badge could theoretically be awarded to someone answering in popular tags on a slow night or on the weekend when the activity is fairly low. If OP has a trigger finger on the accept button, the question is likely to be considered solved and mostly ignored, so it will not get as many views, or get accepted before the 10-view mark is met.
I like the idea of what it's trying to encourage, but it may need some work. Perhaps something more geared towards answering in tags with X or less followers rather than views.