From 11a or 11b, move forward and read the document on the desk. Make your choices, turn around and follow the hall out of the ward. If you don't read the document, the doors at the end of the hall will be locked. Go passed the elevator and into the next wards hall. Enter the fourth set of doors on the left. Immediately to your left in this room is a desk. On the corner of this desk is a skull. Click on the skull to examine it for the achievement.