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