Here is the full list of all 21 DreamWorks Spirit Lucky's Big Adventure achievements.
Ride to Crow's Nest Hill
Complete the photography tutorial
Help Dad find his tools
Show the map to your PALs
Discover what is in Mom's box
Complete your chores in the Stable
Help your PALs with their chores
Follow Hendricks to discover the mares whereabouts
Reunite the mare with the herd
Cross the river through the Beaver Dam
Help the herd cross the bridge
Reach the Starfish Shaped Rock
Chase Hendricks and attempt to recover the map
Help Dad by taking photos of the Railway expansions
Free Hendricks' horse and lead him to the herd
Photograph Miradero, at night, for Aunt Cora
Scare the wolves to help the herd cross the Red Oak Forest
Lucky is trapped in the Old Copper Mine! Find help in Miradero!
Avoid the bear in the Mountain's pass
Prevent Hendricks from finding The Secret Valley
Call the herd to The Secret Valley