Here is the full list of all 50 Lust Theory - there are Season 1 achievements.
Spied on Zoe playing
Acquired all the other achievements
Spied on Megan changing
Spied on Zoe in the girl's locker
Asked Ellie to **** ****
Blackmailed Nicole twice
Was left naked in the School hallway
Smashed the clock
Found out about cellulite from Elizabeth
Made Zoe cry
Told Nicole the truth about Ellie's gun
Told Ellie you like trains
Walked home with Zoe after school
Barged into Megan's room
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
Hit Taylor with the ball
Finished the "NFG day" 1
Sat through the whole main menu video
Used the Gallery
Finished the main story
Experienced the first "Lust Time"
Finished "Freeze day"
Touched Sophie without asking
Got enough experience for Ellie's game
Got impaled by Jessica's heel
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
Blocked the ball
Clicked on the "Whatever" poster
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
Used the Hints button in free roam
Chose all the correct answers on the pop quiz
Found EVERYTHING
Used the fast-forward button to reset the day
Used the "Angle button" once
Finshed the intro with Nadia
Checked out the "About" screen in the menu
Names all the relationships
Used the "Panic button" once