With March drawing to a close, and April rapidly approaching, you'd be a fool not to check in with the Calendar Man in Batman: Arkham City (Xbox 360)
. April 1st is one of the 12 dates you'll need to visit the date obsessed villain in order to unlock the Storyteller achievement.
For the Xbox 360 version, this achievement is what your efforts will ultimately unlock:
For those that have been been exploring Batman: Arkham City (PC)
on PC with GFWL, then this is the achievement you've been working towards: