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