This topic was made in July 2013, around 9 months ago. Even if he plays The Binding Of Isaac anymore, he probably wouldn't check this regularly. No point in posting a topic over 1-2months old. that hasn't been replied to in a while.
In the Binding of Isaac Rebirth, you have to finish the cathedral 6 times with any character), and not to beat mom's heart or It Lives... Also, there is a pretty big forum concerning the fact that you HAVE to kill Isaac in the Cathedral with 6 DIFFERENT characters, but that is not true. i already have 5 pieces of the polaroid and I only played with Azazel (once you go black, you never go back)