Here is the full list of all 86 Lust Academy - there are Season 1 achievements.
Summon Leona through the sorting book
Attend Sabrina's first class
Mix a Reflection Potion
Mix a Lesser Heal Potion
Spy on Amelie
Have your first kiss with Hayley
Get a job at the cafe
Get a letter from the Academy
Sneak a peek at Ashley
Do not sneak a peek at Ashley
Read someone's thoughts
Find out about houses in Cordale
Comfort Hayley
Pass the exam and enter the Academy
Get on Leonheart house
Get textbooks from Ameliе
Learn a combat bolt
Correctly name the potion recipe in Sabrina's class
Defeat the phantom soulstealer
Make love with Lily in the forest of mushrooms
Stick your fingers in Lily's panties
Reject Lily at the Academy
Have your first kiss with Lily
Get the highest tip possible
Catch 25 fishes for Gordon
Drink Vanessa's signature cocktail
Catch 50 fishes for Gordon
Catch 100 fishes for Gordon
Get a massage
Save Elijah's brother
Win Duel
Win 5 Duels
Win 10 Duels
Go to a desert island
Make love with Hayley on the beach
Get the Lion's Seal
Volunteer for Victoria's class
Win the weekly house competition
Defeat the student from Adderin in a duel.
Make love with Lily at the Academy
Meet Mushroom girl in the forest
Reject Lily in the forest of mushrooms
Return a lost folio to Amelie
Return 5 lost folios to Amelie
Return 10 Lost Folios to Amelie
Help Amelie deal with the Elves
Apply a potion during a duel
Click on the rubber ducks in the house
Click on the ducks in the bathroom at Leonheart campus
Ask Haley out on a date
Take Haley on a second date
Get bitten by Vanessa
Find out the truth about Audrey
Reject Audrey
Find books for Lily
Agree to have sex with Audrey
Prove to Naomi that you are worthy of her
Agree to help Naomi with her potions
Get into a secret room
Sleep with Audrey in her true form
Become a participant in the tournament
Don't take advantage of Samantha's weakness
Sneak peeks at Molly in the morning
Get milk for Audrey
Take Audrey to a closed cafe
Kiss Samantha on the lips
Kiss Samantha after the party
Run into Samantha in the bathroom
Catch 30 fishes in one fishing trip
Save Adele from Diego
Agree to help Haley investigate E. Bloom mystery
Make love with Naomi at the library
Get a blowjob from Naomi
Steal the answers to Naomi's test
Find out the truth about your parents
Reject Naomi
Attend Victoria's first class
Take additional class from Victoria
Save Cordale from destruction
Get Samantha to help with the ritual
Agree to help Lily lead Leonheart to victory
Get in the VIP with Lucy
Get in the VIP with Sadira
Go on a date with Adele
Complete Season 1 main storyline