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