Here is the full list of all 50 Lust Theory - there are Season 1 achievements.
Checked out the "About" screen in the menu
Acquired all the other achievements
Asked Ellie to **** ****
Finished the "perfect" day
Finished the "NFG day" 4
Finished the "NFG day" 3
Found out about cellulite from Elizabeth
Finished the "NFG day" 2
Hit Taylor with the ball
Blackmailed Nicole twice
Finished the "NFG day" 1
Spied on Zoe playing
Spied on Megan changing
Found the secret photos on Nicole's phone
Spied on Zoe in the girl's locker
Walked home with Zoe after school
Was left naked in the School hallway
Touched Sophie without asking
Made Zoe cry
Told Nicole the truth about Ellie's gun
Barged into Megan's room
Ignored Ellie
Used the "Panic button" once
Sat through the whole main menu video
Clicked on Zoe's house enough times
Finished the main story
Experienced the first "Lust Time"
Finished "Freeze day"
Smashed the clock
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
Spied on Megan showering
Told Ellie you like trains
Blocked the ball
Used the Gallery
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
Chose all the correct answers on the pop quiz
Used a certain little red button
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
Names all the relationships