Here is the full list of all 21 Scrap Garden - The Day Before achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Finish the game without being damaged
Eliminate 100 enemies
Eliminate 50 enemies
Break 100 boxes
Break 50 boxes
Collect 500 spares
Beat the Boss!
Finish the game
Find the Engineer
Break into the computer.
Eliminate 10 enemies
Fix the water pipes
Find something in the collector
Collect 300 spares
Jump into the water
Break 10 boxes
Collect 100 spares
Find old arcade machine
Collect 50 spares
Collect 10 spares
Start the game