It's Mother's Day tomorrow for you guys in the states. A day to simply show your mum (mom) how much you love and appreciate her for the millions of things wonderful mothers of the world do for us throughout our lives. For https://www.trueachievements.com/Batman-Arkham-City-xbo....htm
players, make sure you, or even your gaming mum, pay The Calendar Man a visit in the city tomorrow and enjoy one of 12 murderous dates you need to go on with the man to chip away at this achievement:
If you really want to, you can just pop this achievement offline
by not connecting to Xbox LIVE and adjusting your consoles dates before paying The Calendar Man 12 seperate visits.
For those remaining online, don't forget to dress for the occasion tomorrow, May 13th.