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