You can buy photo albums and autograph books at the shops throughout the lands. Before you buy an autograph book it will ask you if you're sure you'd like to make the purchase. Before you click OK you can read the descriptions and it should tell you everyone's autographs you need. For photo albums there should be signs bouncing that designate a picture spot or will have a blue mark on the ground with an arrow facing towards the picture spot. Just take out your camera, go near it/on it and hold out your arm, it should zoom in for you. Once you complete all of the books and albums the achievement should unlock.