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.
Complete the game!
Finish Scene with Sara!
Complete the gallery!
Finish Scene with Victoria!
Finish scene with Laura!
Finish threesome scene!
Finish scene with Satomi and Reika!
Finish scene with Aria!
Finish scene with Mai!
Finish scene with Toshiko!