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