Here is the full list of all 27 Paradise Cleaning achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Clear Relfilym's stage 1
View Ao's CG at gallery for the first time
View Arika's CG at gallery for the first time
Clear All Ao's stage
Clear Ao's stage 4
Clear Ao's stage 3
Clear Ao's stage 2
Clear Ao's stage 1
Clear All Arika's stage
Clear Arika's stage 4
Clear Arika's stage 3
Clear Arika's stage 2
Clear Arika's stage 1
Start the game
Clear Relfilym's stage 2
Clear Relfilym's stage 3
Clear Relfilym's stage 4
Clear All Relfilym's stage
Clear Kuko's stage 1
Clear Kuko's stage 2
Clear Kuko's stage 3
Clear Kuko's stage 4
Clear All Kuko's stage
View Relfilym's CG at gallery for the first time
View Kuko's CG at gallery for the first time
Finish Tutorial
Collect All CGs