When you are in the school with Chloe and she asks you to look for items, go into the science classroom (same room as optional photo #3)
To the right of the back of the classroom, there's a cabinet with chemistry stuff inside. To the right of the cabinet is a model skeleton with a cigarette stuck in it's teeth. Take a photo of this, the achievement will unlock.
Reabo gave me permission to use his video in this guide; special thanks go to him!