Someone named "the Dour Hardiness of Roughness". Made even more special by the fact she was bedridden at the time; I released some goblins and a troll in the hospital to "euthanize" the crippled patients. Didn't work, because I had activated the squad she was enrolled in to kill them afterwards... and she magically found the strength to get up, defend the weak, and earn her title. (She died shortly after because she never went back to her bed, nobody judged useful to drag her back there, and she was very thirsty.)
Another is "the Tragedy of Urges". Basically, his urge to beat the shit out of goblins cost him one hand early on, but that didn't stop him from being your average badass expedition leader (before his own son became mayor!) and militia captain. Then he lost the use of the second arm, and after struggling for a while to learn to forget ever grasping anything again, he started killing stuff again by kicking and biting them. Was very recently involved in another tragedy: a young berserk orphan who he "neutralized" with a swift kick to the head, the kid has some family left and an enrolled 12-year-old brother.
The last one is a brave soldier who gained his title of "the North Urn-Holes of Flame" by killing alone a FB made of fire. He died, roasted alive, seconds after that, but man, was that awesome.
Other special mentions without any particular story behind them: "the Silvery Lessons (appropriate for a Hammerdwarf whose weapon would be even more effective if it were made of silver)", and the deceased "Reclusive Purge".