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