You will need to complete almost all tasks/adventures for this, this is one of the last ones I got. Talk to the characters, some of them will give you a picture book to take photos. Be sure to collect all photo albums from characters.
Hidden Mickeys are easy enough if you use the guide for that achievement.
You can also get the Mickey and all his Friends, Pooh and all his friends, Buzz and all his friends achievments which will help your progress on this one.
Some photo Albums and Autograph books are purchased at the stores. (I think all autograph books are)
Autographs (9 books, 46 signatures total) autographs are straightforward enough. Each time you interact with a character hit
to get their autograph, then exit the interaction and take a photo to collect all "Snapshot" photos. Do this with each character in the park.
Photo Passes (79 total), are all the jumping photo stands throughout the park, they will no longer jump once you've taken the photo.
Hidden Mickeys (98 total), please see hidden mickey achievement guide.
Discoveries (108 total), these qualify as task photos and "land" photos. The task photos will be somewhat easy because the gold line will guide you, you will get these tasks from characters. The "land" photos are a little harder but you will identify them as the blue circles on the ground you can also see a b+w preview in your album which may help you find the photo spots. YOU MUST BE HOLDING YOUR CAMERA TO SEE THE BLUE CIRCLES.
Characters that give you picture books;
(You may have to complete some tasks before they give it to you)
Mad Hatter (or Alice, I don't remember which)
Queen of Hearts (or Alice, I don't remember)
Snapshots (44 total) These are all the photos you take with characters, the trickiest one of these is the "Star Command Graduation" photo which you receive after helping Buzz complete all his tasks.
I know it's not a step-by-step guide but hopefully this helps point you in the right direction.