Here is the full list of all 10 Quickie: Fantasy Adventure achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Finish scene with Toshiko!
Finish scene with Mai!
Finish scene with Aria!
Finish scene with Satomi and Reika!
Finish threesome scene!
Finish scene with Laura!
Finish Scene with Victoria!
Finish Scene with Sara!
Complete the game!
Complete the gallery!