I looked through filter options but no such option jumped out at me. Would be nice to comb through “Solved” results rather than a sea lost souls T^T
This would also allow to efficiently find unsolved posts and finally save the poor souls, too, yet it clearly has failed. It’s in the advanced panel:
However, note that many good answers were never marked as solved for reasons too numerous to mention. A filter like that may as well be detrimental in some cases, you could miss out. I’d say that, on average, only every third acceptable answer gets flagged as Solved. Probably less.
Admittedly, this has improved in the recent years and moderators swoop in to mark it themselves.