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