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