How Many Times Have You Earned It?

I think it's the (hidden) one where you have to have bladder failure in a house with loads of toilets or something. Seeing as most Simmers probably don't have that many bathrooms, it'll be unknown to them. I only know about it because I once read it on Carl's. I normally play small households so I never have a need for that many toilets. And I'm an avid micromanager, so bladder failure is very rare in my game.