One day, eventually, people will receive all the trophies and such they've received from the Twelve Labours. At least, that's what I understand from what has been said before.
Anyway, to get the little title, on your profile where 'Visitor Messages' are there should be a section called 'Trophies'. You click on that, and it should show you the list of your trophies and have a button that says 'Activate' in which you click and will give you your little title heading. Not all of the trophies exist currently, I think, not sure.