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.
Finish Tutorial
View Ao's CG at gallery for the first time
View Kuko's CG at gallery for the first time
View Relfilym's CG at gallery for the first time
Collect All CGs
Clear All Kuko's stage
Clear Kuko's stage 4
Clear Kuko's stage 3
Clear Kuko's stage 2
Clear Kuko's stage 1
Clear All Relfilym's stage
Clear Relfilym's stage 4
Clear Relfilym's stage 3
Clear Relfilym's stage 2
Clear Relfilym's stage 1
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
View Arika's CG at gallery for the first time
Clear Arika's stage 4
Clear Arika's stage 3
Clear Arika's stage 2
Clear Arika's stage 1
Start the game