Here is the full list of all 17 Negligee achievements. It takes around 2-3 hours to unlock all of the achievements on Windows.
Complete all endings for the Game
Unlock all of the games Epilogues
Complete the games ultimate Harem ending
Unlock Charlotte's Bad Ending
Hire Sophie during the Interview
Hire Charlotte during the Interview
Unlock Jasmin's Bad Ending
Unlock Sophie's Bad Ending
Unlock the Bonus Epilogue for Charlotte
Select Charlotte for the Permanent Position
Unlock the Bonus Epilogue for Sophie
Select Sophie for the Permanent Position
Unlock the Bonus Epilogue for Jasmin
Hire Jasmin during the Interview
Select Jasmin for the Permanent Position
Pick Perfect Outfits for Yuuki & Melissa
Get Fired from the Store