I can't get this achievement to unlock (the one last one I can't unlock...). I even have screenshots of two (2!) characters becoming unbroken on my last playthrough that I did for 7 hours for the single purpose of unlocking it, with them going from "Broken" to "(none)".
I even left them broken for a day, being scared all the while that they were going to rob me or kill themselves.
Is there some other trick to it? Or is it broken?