Here is the full list of all 56 Little Walker achievements.
Talk to the funky seagull
Found a shortcut
Discover the weirdos
Went to the bathroom maybe?
Jump 1000 times
Ran on hot coals for a while
Ring the bell above the abandoned mission
Enter the pyramid
Discovered the desert birds burrow
Dancing in the desert blowing up the sunshine
Conquered the cliff
Did the training room
Meet the moleman
Straight up murder Carl
Disturb the penguins
Use the air breaks
Hi again!
Pick up the rock
Ate the trashcan sandwhich
Squish the fly
Ate one of those red berries
Level up
Myup that was dookie
Fail to get back up
Flipped the day/night switch
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
Get an achievement
Defeat 100 enemies
Get 64 plusms
Walk 500 miles
Walk 500 more
Kick a dude in the head
Pop 99 balloons
Touched the apple wife (sadly she had apple-butt)
Drank the very last swig that was just sittin there
Straight up murdered a majestic creature of the sky
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
Walked on the rainbow bridge
Rode the golden dragon
Felt the mighty power of the monoforce
Read the sign you shouldn't have
Beat the game on either mode
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
Beat the game without hitting 0 hp
Discover that one place
Beat hard mode!