This will be very easy to do. Start any song in Yearbook mode. Each song will contain 3 pictures you can take during the course of the song. You will see notes with a camera on them, and you will have a limit time to press A on the controller to capture that picture. Another note, you must do a couple combos (streak) or better to activate the option to take the picture. If you do poorly prior to it, you will still see the green camera notes appear, but will not be able to capture the picture.
So try any song on Easy and choose the shortest song, and find the 3 pictures to snap. Achievement will unlock at the end of the song