Here is the full list of all 53 Supraland Six Inches Under achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Beep beep
You're probably 50% done now
Very unrealistic
Boing
Improvised
You were hoping you would never see him again
The kids liked it
Not sure if it's just a blue stone pickaxe
And all I got was this lousy chest
Heated up the water
Don't look behind you
Beat the big guy
You feel so OP all of a sudden
Saved it from exploding
He loves the ladies
I used to get the earlier in the previous game
Much boom boom
Lifting weights
Gold Module
You're a criminal
Bzzz bzzz
Broke into the bank
Get an accountant
Beat the arena next to town
You smell so nice
Made it to the 2nd floor
You are less lost
It feels so stable
Brings back the good old economy
Excellent plumbing work
I can fly... for a very short moment
So much industry
You're so attractive
Purple lines
This one will never break
Hello there!
Defeated Surprise Chest
You're halfway through the game already
He did all the work
Run faster
Hit Rock Bottom
Jump Higher!
Bending the knee gets you further
It's made of wood, it will last forever
Killed the ghouls
Cage Town
Very secret!
Flying, sort of
You feel way too OP now
Burn 'em all
Left the level
It probably has no use
Much secret!