Here is the full list of all 56 Little Walker achievements.
Beat the game on either mode
Beat the game on auto-walk mode
Read the sign you shouldn't have
Felt the mighty power of the monoforce
Rode the golden dragon
Walked on the rainbow bridge
Ran on hot coals for a while
Straight up robbed some dudes tomb
Straight up murdered a majestic creature of the sky
Drank the very last swig that was just sittin there
Ate one of those red berries
Ring the bell above the abandoned mission
Myup that was dookie
Enter the pyramid
Jump 1000 times
Dancing in the desert blowing up the sunshine
Conquered the cliff
Touched the apple wife (sadly she had apple-butt)
Meet the moleman
Straight up murder Carl
Disturb the penguins
Use the air breaks
HAPPY FEET, THAT AIN'T FALCO
Fail to get back up
Discover that one place
Hi again!
Pick up the rock
Ate the trashcan sandwhich
Flipped the day/night switch
Level up
I get knocked down! but I get up again!
I hope you're proud of yourself
Get a plusm
Get spoken to by any character
Went to the bathroom maybe?
Get an achievement
Defeat 100 enemies
Get 64 plusms
Walk 500 miles
Walk 500 more
Squish the fly
Talk to the funky seagull
Kick a dude in the head
Pop 99 balloons
Discovered the desert birds burrow
Found spocker
You just have to keep eating food that's been sitting around, don't you?
Found the invisible block
Did the training room
Found moon mode... Oi.
Found a shortcut
Unlock 7 blocks
Discover the weirdos
Found the legendary baby coin
Beat the game without hitting 0 hp
Beat hard mode!