Here is the full list of all 69 Lust Theory Season 2 achievements.
Made the last decision
Completed "Xmas Story" Hidden Event
Acquired ALL "Hidden Event" achievements
Acquired ALL "Goodbye Story" and ALL "Hidden Event" achievements
Completed "Halloween Story" Hidden Event
Completed "The Test" Hidden Event
Completed "Fifty Shades Of Megan" Hidden Event
Completed "Pool Party" Hidden Event
Completed "Mind Games" Hidden Event
Completed "Lovebirds" Hidden Event
Completed "Maturity" Hidden Event
Completed "NFG Day 2" Hidden Event
Completed "NFG Day 1" Hidden Event
Completed "Nursed Back To Health" Hidden Event
Completed "Slumber Party" Hidden Event
Found a secret scene with Jessica
Completed "Officer Kate" Hidden Event
Completed "Sleep Day" Hidden Event
Completed "Game Show" Hidden Event
Checked out the Gallery
Completed "Meeting Emma" Hidden Event
Completed Amy's Goodbye Story
Completed ALL "Goodbye" stories
Completed Sophie's Goodbye Story
Completed Nicole's Goodbye Story
Completed Ellie's Goodbye Story
Completed Zoe's Goodbye Story
Completed Elizabeth's Goodbye Story
Completed Jessica's Goodbye Story
Completed Megan's Goodbye Story
Asked Carol for more time
Broke the game
Completed "Five To Tango" Hidden Event
Chose to hide from Amy
Managed to duplicate yourself
Chose to push Amy into the pool
Chose to not kiss Amy
Took a risk with Ellie
Let Zoe drive
Checked all your missed texts
Chose to stay with Jessica in the living room
Witnessed the impossible
Chose to peek at the right time
Completed Freeze day
Clicked on the NEW little red button
Clicked on all three little buttons
Had an encounter with REDACTED
Chose the Jesus costume at the mall
Chose to stay with Sophie while she's angry
Unlocked Amy's story
Used your nose
Took the pill
Chose the wrong choice in the garage with Ellie
Acted like a redneck towards Ellie
Unlocked Sophie's story
Got every answer right on Nicole's quiz
Completed "Xmas Story 2" Hidden Event
Chose to be risky with Elizabeth
Completed a day as Megan
Told Megan you don't regret anything
Talked to everyone at home
Talked to everyone at the party
Chose to be honest with Ellie at the party
Completed the recap
Clicked on the little red button
Clicked on the little angle button
Completed the intro
Found PANIC! mode
Acquired ALL other achievements