Here is the full list of all 50 Lust Theory - there are Season 1 achievements.
Found out about cellulite from Elizabeth
Acquired all the other achievements
Finished the "perfect" day
Finished the "NFG day" 4
Finished the "NFG day" 3
Was left naked in the School hallway
Hit Taylor with the ball
Finished the "NFG day" 2
Finished the "NFG day" 1
Walked home with Zoe after school
Sat through the whole main menu video
Checked out the "About" screen in the menu
Spied on Megan changing
Spied on Zoe in the girl's locker
Barged into Megan's room
Asked Ellie to **** ****
Ratted Jessica out about her date
Ignored Ellie
Finished the main story
Experienced the first "Lust Time"
Blackmailed Nicole twice
Clicked on Zoe's house enough times
Finished "Freeze day"
Smashed the clock
Got enough experience for Ellie's game
Got impaled by Jessica's heel
Touched Sophie without asking
Spied on Zoe playing
Made Zoe cry
Found the secret photos on Nicole's phone
Reset the day with all the girl's stories active
Told nicole not to assume your gender
Spied on Megan showering
Told Nicole the truth about Ellie's gun
Told Ellie you like trains
Blocked the ball
Clicked on the "Whatever" poster
Used the Gallery
Got to "Free roam mode"
Tried going into Megan's room at night
Found all 4 interactions before Elizabeth came home
Found EVERYTHING
Used the fast-forward button to reset the day
Used a certain little red button
Chose all the correct answers on the pop quiz
Used the Hints button in free roam
Used the "Angle button" once
Finshed the intro with Nadia
Used the "Panic button" once
Names all the relationships