How to Get the 'Dial Z for Murder' Achievement in Batman: Arkham City

Victor Zsasz is one seriously messed up dude. Since I don't read too many Batman comics, I'm not that familiar with the character. But after experiencing him in Batman: Arkham City, I'm ready to read up more about him.

To get the 'Dial Z for Murder' achievement, you have to answer the ringing payphone. When you do, Zsasz will be on the other end, kind of taunting you. He then says that if you don't keep answering phones within a certain time limit, people will die. Answer all of the phones within the time limit, and you'll find out where he's hiding. From there, head into the building and take down Zsasz for good. Check out the video for specifics.