Here is the full list of all 15 Circuits achievements. It takes around 5-6 hours to unlock all of the achievements on Windows.
Complete the first three levels without any fail
Build all levels without switching to individual layers, with the level 3 exception.
Build 5 levels
Build 10 levels
Build 15 levels
Build 20 levels
Build 25 levels
Build 10 levels without using hints
Build level 2 in less than 4 minutes
Put the level 10 loopers correctly with the first check
Read the credits after complete the game
Build correctly your first Looper
Use the turbo for more than 6 seconds
Skip more than five levels
Build the level 16 switcher in the correct way for the first check