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