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.
You feel way too OP now
Flying, sort of
Very secret!
Burn 'em all
You were hoping you would never see him again
The kids liked it
Beep beep
Boing
Don't look behind you
You're probably 50% done now
Very unrealistic
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
You smell so nice
And all I got was this lousy chest
Not sure if it's just a blue stone pickaxe
Improvised
Lifting weights
Gold Module
You're a criminal
Bzzz bzzz
Broke into the bank
Get an accountant
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
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
Defeated Surprise Chest
Hello there!
Purple lines
This one will never break
Beat the arena next to town
You're halfway through the game already
Heated up the water
Left the level
It probably has no use
Much secret!