Here is the full list of all 20 Frisky Business achievements.
Get all possible endings
Get it on with all the girls
Piss off Balbina
No Wrong Answers in Trivia
Threesome with Balbina and Serena
Break the 4th Wall
Dated Lucy
Get it on with Jenny X4
Collect every piece of evidence
Complete a play through with no sexy times
Be a Jerk to Sam and Charlie
Get it on with Tiffany
Dated Balbina
Get the true ending
Be nice to Charlie and Samantha
Be nice to Charlie
Have Threesome with Jenny and Gertrude
Get it on with Claire
Dated Jenny
Peep through all the girls windows