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