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