This Achievement is obtained after exiting the main building, you will see a fountain in the middle of the area in front of you, which if you walk up to you can interact with it by sitting down.(Not sure if this is necessary, but it's what I did.) after some dialogue and pressing
to stand back up, look towards the statue in the centre of the fountain and press
to take the photo, a few seconds later you're achievement will pop.
Can confirm that if you miss it, coming back to get it through 'Collectibles Mode' will still count towards