Here is the full list of all 42 Scrap Garden achievements. It takes around 3-4 hours to unlock all of the achievements on Windows.
Eliminate 300 enemies
Break 100 boxes
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Complete the game
Defeat the dragon
Find the card
Find the green crystal
Find all holograms
Get burned by the dragon
Get to the end of rails
Defeat the toad
Get eaten by the toad
Eliminate 100 enemies
Find the pumpkin
Collect 1500 crystals
Defeat the octopus
Get bitten by piranhas
Go down the hill
Break 50 boxes
Find the snow globe
Defeat the gorilla
Take a punch from the gorilla
Eliminate 50 enemies
Find the mp3 player
Collect 1000 crystals
Defeat the worm
Let the worm toss you up in the air
Find the Rubik's cube
Find the alarm clock
Break 10 boxes
Collect 500 crystals
Collect 300 crystals
Find the camera
Throw a ball into the basket
Eliminate 10 enemies
Break 5 policemen
Visit a friend
Collect 100 crystals
Complete the arcade minigame
Die in the shadows
Get back the generator
Start playing