Here is the full list of all 15 Sex Detective [18+] achievements.
Surrender to Katherine and go to jail.
Try to escape from Katherine.
Get cured by electroshock.
Awaken the monster through hypnosis.
Complete all four endings
Get the first clue
Get 9 clues
Collect all the clues
Complete one game on the clue board without skipping
Complete all games on the clue board without skipping.
See the first dream
See all the dreams
Discover all the adalts
Pick Katherine's side
Take Ann's side