Kinect Disneyland Adventures

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)
Beast
Genie
Buzz
Pooh
Woody
Mad Hatter (or Alice, I don't remember which)
Queen of Hearts (or Alice, I don't remember)
Pinocchio
Pinocchio (again)
Aurora
Naveen
Ariel
Black Barty
Stitch
Br'er Fox
Toy Aliens

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.

To get this achievement, you have to complete all the autograph and photo albums. To complete all the autograph books, first you need to purchase all the albums from the shops. Each shop has a different selection of albums, so make sure you buy all of them from all the shops. There are 9 total autograph books and 46 signatures needed.

To complete all the photo albums, you need to take a lot of photos with the camera you get from Mickey. Before you can take many of these photos, you either have to purchase or be given the albums you need to fill (many of the discovery photos are albums given to you to complete certain tasks).

*79 photo Passes in 9 albums (the hopping signs)
--- Frontierland (6)
--- New Orleans Square (6)
--- Critter Country (6)
--- Main Street, U.S.A. (5)
--- Tomorrowland (6)
--- Mickey's Toontown (19)
--- Adventureland (4)
--- Disneyland Landmarks (6)
--- Fantasyland (21)

*108 Discoveries in 24 albums (the glowing blue circles)
--- Beast's Picture Book (4)
--- Mickey's Toontown (8)
--- Genie's Fashion Research (6)
--- Frontierland (6)
--- Critter Country (6)
--- Buzz's Top Secret Reconnaissance Data (3)
--- Rustler Casebook (3)
--- Christopher Robin's Picture Book (3)
--- Hatter's Photo Album (3)
--- Pinocchio's School Book (4)
--- Adventureland (8)
--- Aurora's Castle Album (4)
--- Naveen's New Orleans Moods (3)
--- Ariel's Parade Float Research (4)
--- Black Barty's Nautical Almanac (3)
--- Stitch's Album for Jumba (4)
--- New Orleans Square (6)
--- Pinocchio's Extra Credit Storybook (4)
--- Br'er Fox's Rabbit Tracks (3)
--- Alien's Research Album (3)
--- Tomorrowland (5)
--- Fantasyland (7)
--- Main Street, U.S.A. (5)
--- Alice's Album for the Queen of Hearts (3)

*98 Hidden Mickeys in 8 albums

*44 Snapshots in 9 albums (pictures of characters)
--- Mickey and Friends (8)
--- Critter Country (7)
--- Star Command Graduation (1)
--- Fantasyland Vol 1 (6)
--- Fantasyland Vol 2 (7)
--- Adventureland (5)
--- Tomorrowland (3)
--- Frontierland (3)
--- New Orleans (4)

Note that all the characters aren't available right from the start. Some of them require certain tasks to be done before they appear (like The Genie, Jasmine, and Mowgli).