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Lust Theory > Guides > Kilroy's Guides
561 ratings
Kilroy's Guide to Lust Theory
By Kilroy
A step by step walk through of the game with how to acquire the different achievements and hidden scenes.

This guide was created on the Steam build 1.1 - Early Access version of the game.

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Created by
Kilroy
In-Game
Fake Lay
Category: Achievements, Characters, Secrets, Walkthroughs
Languages: English
Posted
Updated
31 Aug, 2021 @ 6:43pm
4 May, 2024 @ 8:49am
50,352 Unique Visitors
1,132 Current Favorites
Guide Index
Overview
Introduction 
The Tutorial 
Day 4 
Day 5 
Day 6 
Day 7 
Day 8 
Day 9 
Day 10 
Day 11 
Day 12 
Day 13 
Day 14 
Intermission - Hidden Event 4 
Intermission continued - Hidden event 5 
Day 15 
Day 16 
Day 17 
Day 18 
Day 19 
Day 20 
Day 21 
Day 22 
Day 23 
Day 24 
Day 25 
Day 26 
Day 27 
Day 28 
Day 29 - Freeze Day 
Day 30 
Second Intermission - Hidden Event 6 
Second Intermission Continued - Hidden Event 7 
Second Intermission Continued - Hidden Event 8 
Day 31 
Day 32 
Day 33 
Day 34 
Second Play Through Achievements 
Comments
Introduction
It is not possible to obtain all of the achievements on one play through, without using saved games to repeat events. On the first play through I'm going to go for the less obvious achievements.

I decided to break the game down into days after the tutorial portion, even though there is no way to keep track of the day number in the game. I put in Save Game prompts for the areas where you will need to play through twice to get an achievement. You could get to the next day, save, then load the save and go through the prompts to get the achievement by going to the Second Play Through Achievements sections. Most of the achievements in the Second Play Through section are the act like an ass type achievements.

As I already had most of the achievements this guide has where you should earn the achievement, they are best guesses and not to be taken as gospel. For the few achievements that aren't actually mentioned you should gain them along the way.
The Tutorial
While playing the tutorial part of the game you will not have all of the options available that you will have later.

Before you start playing let the whole main menu video play through to earn the AFK achievement.

The game starts off and you get to select your name and your relationships with the three women in the house, two about your age and an older woman. Only relationships where these people shouldn't be having sex with each other will make sense in the context of the story.

Receive the First step achievement

Press P to activate the Panic screen and earn the Much panic! Such wow! achievement

The game opens with a scene with Nadia.

Receive Sweet dreams achievement.

A car alarm goes off and wakes you from your dream about Nadia.

Jessica comes into your room and tells you to get up.

Press the Angle button to see Jessica from different angles

Earn the Different perspective achievement

Early on in the game you aren't going to have any real options. You're going to have a single choice. The more rewarding choice will be presented in
BOLD text
and the less rewarding will be in regular text.
Get up
Ignore
Go into the Hall

Go into the Bathroom
Take a shower
Brush teeth
Go into the Hall

Go downstairs

Go to the Kitchen

Eat your breakfast

Go to Town

Go to School
No
Enter school

Click on Zoe and Megan

Go to class
Sulfuric
High
Sulfate
Vitriol
Burn
Earn Mr. Heisenberg achievement

Go back into the Hallway

Go back to your house

Go into the Living Room

Click on Jessica
Leave her alone
Press the Hints button, you're going to be doing this a lot for this game.

Go to the Garage

Click on the work bench

Click on the Red button in the upper right when Elizabeth comes in.

Earn the X-Ray achievement and see Elizabeth topless.

The Red button will sometimes remove clothes, other times it will show the girl(s) in different outfits, so X-Ray is a bit misleading.

Go to the Kitchen

Go to Living Room

Click on Megan
Watch TV
Go to your room
She went out
Go to your room
Go study
Continue studying

Day 2
Ignore
Go into the Hall

Go into the Bathroom
Take a shower
Brush teeth

Go into the Hall

Go downstairs
Eat Breakfast
Go to Town

Click on the house next to your eight times

Earn the Wrong house, m8! achievement

Go to School

Enter School

Click on Megan and Zoe
Go to class
Go to Classroom
Sulfuric
High
Sulfate
Vitriol
Burn
Go into Living Room

Click on Jessica

Go to the Garage

Click on the Work Bench

Go to your room

Click on the bed
Relax
Go into the Hall

Go into the Bathroom

Click on the sink

Click on the sleeping pills

Day 3
Answer
Go into the Hall

Go into the Bathroom
Take a shower
Go downstairs

Go to the Kitchen

Click on Elizabeth
Save Game 1
Friendly
Pick either options
No (Friendly)
or
I'll think about it
Enter School

Go to Classroom

This is the last time you'll have to take the Pop Quiz
Sulfuric
High
Sulfate
Vitriol
Burn
Ask her directl
Truth
Go home

Earn the Walk with me achievement


Go to the Living Room

Click on Jessica
Try talking to her some more
Talk some more
Go to Jessica's room

Click on the laptop
Enter the password
Go to your room

Explore the house until you earn The Explorer achievement


Click on your bed

Go to the Living Room

Click on Megan
Fine
Go to your room
She went on a date
Earn the Snitches get stitches achievement
Slightly open the door
Earn the Perv! Achievement


Earn the Finally free achievement

Click on your phone in the upper left

Click on the Gallery icon

Earn the Pretty Pictures achievement

Press the Hints button

Earn the Where was I? achievement

Now we're ready to start playing
Day 4
Answer Zoe


Go to the Kitchen and click on Elizabeth

Pick either option
How's work
or
How are you doing?
Use the Map and go to the Town Map

Go to the School

Go into the School

Go into the Classroom

Go into the Hallway
Block (You have to do it before the bar disappears. If you miss you can mouse wheel up to try again)
Earn the Like a ninja, or something achievement


Go to Hallway 2 around the corner


Go into the Bathroom


Click on the Whatever Just Wash Your Hands poster


Earn the Equality achievement


Click on Ellie

Go to the Living Room

Use the Fast Forward to get to the night

Click on Elizabeth

Why not
You can pick
Forward Time to Morning

Earn the Reset! Achievement

Day 5
Don't skip Jessica
You're right
Go to Jessica's room

Click on Jessica
Talk
Compliment
Go to Megan's room
Barge in
Earn the Ever heard of knocking? Achievement

You in a rush?
Go to school

Click on Ellie

Walk up to her

Enter school

Enter classroom

Go to Bath Room

Talk to Ellie

Pick any one of the options
Show me your boobs
Show me your ♥♥♥♥♥
A blowjob

Go Home

Go to the Living Room

Click on Jessica

Go to Jessica's Room

Advance time to Evening

Click on Jessica
Make a joke
Go to your room

Advance time to Night

Click on the computer

Click on the computer
Don't touch
Go to Living Room

Click on Elizabeth
Romantic comedy
Day 6
Go to Megan's Room

Click on Megan

Talk about the car alarm

Go to School

Click on Ellie
Sneak up on her
Enter school

Enter classroom

Go to Bathroom

Click on Ellie
I like your outfit
You suck?
Sorry. 'Meant to say "It sucks"
Suck ♥♥♥♥. (Like the Block you have to do it before the bar disappears)
to earn the Creep achievement


I like trains. (Like the Block you have to do it before the bar disappears) to earn the We all do! achievement



Pick either option
You have to do 20 sit-ups
or
You have to run 3 laps around the school
Go back to Hallway 1

Click on the door to the Teacher's Lounge

Compliment her
Ellie will show me her boobs
Earn the Honesty pays achievement


Go back to the Bathroom

Click on Ellie
Give her the gun
Pick whichever one you want to see
Pinch your nipple
or
Squeeze your boobs together
Pick whichever one you want to see
Bend over
or
Lift your leg on the sink
You're done with Ellie until you get your Sexual Experience up to 5.
Sexual Experience 1/5

Go to Classroom

Click on Nicole
I don't like her either
Looks aren't everything
Wait
Go to the Store


Click on Micky
Still working two jobs, I see
Go Home

Advance the time to Night

Go to Jessica's Room
Catch her (Another timed selection, do it before the bar disappears)
Advance time to Morning
Day 7
Rush to the Bathroom (very quick timed event)
If you missed it, mouse up and try again
Slowly open the door
Receive the Steamy Shower achievement


Go to School

Enter school

Click on Megan and Zoe

Go into Classroom

Go to Store

Click on Micky
You got scratch-off tickets?
Go Home

Go to Jessica's Room

Click on the laptop
Try guessing the password
Go to Living Room

Advance time to Night

Click on Elizabeth
You can pick
Yup!
Start jacking off
Day 8
Go to School

Enter school

Click on Megan and Zoe
Try sneaking in closer
Enter the Classroom

Click on Megan

Pick either choice
I heard you and Zoe talking…
or
Err…I thought…
Go Home

Go to Living Room

Click on Jessica

Go to Jessica's Room

Advance time to Evening

Click on Laptop

Go to Living Room

Advance time to Night

Click on Elizabeth

Enjoy the scene
Day 9
Click on Answer Zoe

Go to School

Enter school

Go to Teacher's Lounge

Enter Classroom

Click on Nicole

Go to Hallway 2

Enter the Girl's Locker Room (Locker Room will not be available if you didn't Answer Zoe)

Don't assume my gender! (Another timed response)
Earn the Never assume achievement


Hidden Event 1
Wait about 15 seconds until the Spy on Zoe option appears.
Spy on Zoe
Earn the Peeping Tom achievement


Go Home

Go to Jessica's Room

Click on Laptop
I found it open
Go to Living Room

Advance time to Night

Click on Elizabeth

Enjoy the scene
Sexual Experience 2/5
Day 10
Answer Zoe

Go to School

Go to Classroom

Click on Nicole
Not all men
Not a kid
Stay on the subject
Pick
Back to text message
or
Flirt a little
Earn the Selfie! achievement


Talk some more
Go to Girl's Locker Room
Don't assume my gender! (Timed response)
Go in
Respond
Go Home

Go to Living Room

Click on Jessica
Nothing important
Advance time to Night

Click on Elizabeth

Enjoy the scene
Day 11
Recap everything that happened
Answer Zoe

Click on the door to Megan's Room

Wait about 15 seconds until the Spy on Megan option appears

Hidden Event 3
Spy on Megan
Earn the Peek-a-Boo achievement

Follow Megan
Go to the Classroom
Save Game 2
Go to the Girl's Locker Room
Respond
About the party
Say nothing
They seem okay
I guess they're the right size
Are you sure?
Squeeze her boob
Go to the Girl's Locker Room

Wait about 15 seconds for the Go in anyway option to appear

Hidden Event 2
Go in anyway
Earn the Even girls do it achievement


Go to the Classroom

Click on Megan

Go to Megan's Room

Click on Computer

Click on bed

Click on Bookshelf
Day 12
Go to School

Go to Classroom

Click on Nicole
Blackmail her with the nudes
Bra
Go to the Mall

Redheads
Mention Megan
Go Home

Go to Jessica's Room

Advance time to Evening

Click on Jessica

Click on the Blue Plant


Advance time to Night

Click on Elizabeth

Pick either option
Go balls deep!
or
Go slow
Day 13
Go to school

Go to Classroom

Go to Girl's Locker Room
Wanna go to the party
Yeah
Megan
I just wanted to see your reaction
Pick anyone of the three
Kendall Jenner
Margot Robbie
Kate Upton
Grab her boobs
Show her
♥♥♥ on Zoe (Timed Choice)
Sexual Experience 3/5
Advance time to Afternoon

Go to the Mall
Direct
Big ♥♥♥♥
Just do it
Earn the Black eye achievement


Go Home

Advance time to Night

Go to Jessica's Room
Walk in on her
Day 14
Go to the Kitchen

Click on Elizabeth

Continue staring at her boobs
Brush against her again

Go to School

Go to Classroom

Go to Girl's Locker Room

Sexual Experience 4/5

Go to the Mall
Direct
Big ♥♥♥♥
Don't
Go home

Go to Jessica's Room

Click on the laptop

Go to Living Room

Advance time to Night

Click on Elizabeth
Push it
Go to your room

Click on computer
Intermission - Hidden Event 4
Time for a little break from the main story. Now would be a good time to create a Save point, in case you want to do this again.

Go to the Bathroom

Press the Flush button on the toilet


Make any selections you want, there are no achievements other than NFG 1 for this section. You can reload your save to see what different selections do.

Earn the NFG 1 achievement
Intermission continued - Hidden event 5
Now would be a good time to create a Save point, in case you want to do this again.

Go to the Bathroom

Click on the toilet brush

I'll take my chances
Pick either option
Warn her
or
♥♥♥ on her face
Apologize
After you leave the classroom you will receive the Payback achievement

No
Earn the NFG 2 achievement


You can reload your save to see what the other options do, but this is the best path through the event.
Day 15
The days are going to go by a lot quicker as we start wrapping things up.

Advance time to Afternoon

Go to the Mall

Smooth
Megan
Go Home

Go to Megan's Room

Click on the bed
Day 16
Go to Living Room

Advance time to Night

Click on Elizabeth

Drop it

Go to Your Room

Click on Computer

Earn the Ouch achievement
Day 17
Go to Living Room

Advance time to Night

Click on Elizabeth

You're beautiful
Women like you
Kiss her
Day 18
Advance time to Evening

Go to Elizabeth's Room

Click on Elizabeth

Go to Living Room
Save Game 3
Click on Elizabeth
Everything
Go for it
Day 19
Advance Time to Night

Click on the Computer

Apologize
Day 20
Advance time to Night

Click on the Computer

Sexual Experience 5/5

Earn the Experienced! achievement
Day 21
Go to School

Go to Bathroom

Advance time to Noon

Click on Ellie
Grab her tit
Earn the Karma achievement


Go to Your Room

Advance time to Night

Click on the Computer

Day 22
Go to School

Go to Bathroom

Advance time to Noon

Click on Ellie

Walk past
Pick either option
Let me finger you
or
Lick my balls
Advance time to Night

Click on Computer

Day 23
Suggest another idea


Day 24
Go to School

Go to Bathroom

Advance time to Noon

Click on Ellie

Day 25
Advance time to Night

Click on Bed

Stay awake
Remain "asleep"
Day 26
Go to Jessica's Room
Continue the "Photoshoot Story"
Peek
Pick either option
My sister
or
My girlfriend
Pick either option
Stick it in
or
Don't do it
Day 27
Advance time to Night

Click on Bed

Wait for the girls
Knock
Wrong Answer
Right Answer
Pick either option
Jessica
or
Chloe
Day 28
Go to the School

Go to the Classroom

Click on Nicole

Ask to keep her company
Day 29 - Freeze Day
Smash it
Earn the Smash! achievement


Earn the Everybody, freeze! achievement

Day 30
Go to School

Go to Classroom

Click on Nicole

Continue blackmailing
Receive Blackmail veteran achievement


Advance time to Morning
Second Intermission - Hidden Event 6
Save Game]
Click on Toilet Paper Roll

♥♥♥♥ it

Make your selections and reload or restart as necessary.

Answers for Nicole's "test"
Potassium hydroxide
Three, four, two and one
Allosteric inhibitor
Introduction of a bulky N-alkyl substituent

Earn the NFG3 achievement
Second Intermission Continued - Hidden Event 7
Save Game

Go to the Bathroom

Click on the Toilet

Knock 4 times
Earn NFG 4 achievement
Second Intermission Continued - Hidden Event 8
Save Game
Click on the Toy Bike in Your Room


Earn the Perfection! achievement


Day 31
Go to School

Enter School

Go to Classroom

Talk to Nicole

Talk to her
Don't kiss her

Advance time to Morning
Day 32
Go to School

Enter School

Go to Classroom

Go to Girl's Locker Room

No, I don't like you like that
Go with it

Advance time to Morning
Day 33
Go to Megan's Room

Catch (Timed reaction)
Day 34
Answer
Second Play Through Achievements
Load Save Game 1
Day 3
When talking to Ellie
Ignore (Insensitive)

Earn the Douche achievement

Load Same Game 2
Day 11
Go to the Girl's Locker Room

Respond

About the party

Say nothing

Nothing special

Meh

Insult her

Earn the Heartless achievement


Load Save Game 3
Day 19
When talking to Elizabeth
Big tits
Earn the Say it ain't so achievement

132 Comments
< >
General M-13 / Vindya Miriel 21 Jul @ 4:29am 
True, but they could at least credit the creator.
Kilroy  [author] 21 Jul @ 3:29am 
Imitation is the sincerest form of flattery. It isn't like I make any money from Steam for the guide.
General M-13 / Vindya Miriel 20 Jul @ 2:58pm 
Just wanna point out that this website more or less copied your entire guide
https://www.yekbot.com/lust-theory-walkthrough-for-all-achievements-and-secrets/
reime59 8 Nov, 2024 @ 5:11pm 
I am just taken what I can from the game what is completed
reime59 8 Nov, 2024 @ 5:08pm 
I have talk to them the developers they released the two hidden events with Nichole and Sophia was incomplete and Jessica and Chloe threesome was incomplete.
vachon 13 Sep, 2024 @ 12:06am 
@XeroGXXX thanks. No, I don't like modifying my files for these things. I'll just have to remember which save is save 1, save 2, etc. If I only save when the guide tells me to, and keep them in order then it should be a piece of cake. Thanks again for answering me :D
XeroGXXX 11 Sep, 2024 @ 10:41pm 
@vachon You can't in game. And I'm not sure if editing the files on your disk would break things or not
vachon 11 Sep, 2024 @ 7:18pm 
How can I Name my saves? When I click on save it automatically names it something like, Wednesday, September 11 2024, 20:16. How can I get it to save as Save Game 1?
SensuiJFB 31 Aug, 2024 @ 3:51am 
Thanks a lot, Kilroy. I'll try to do all the events to see if I can spy on Megan. Your guide is helping me a lot to get all the achievements, thanks, Kilroy.
Kilroy  [author] 31 Aug, 2024 @ 3:47am 
Are you doing it on Day 11? I don't remember how rigid the game is on doing things on a specific day, or if there are prerequisites that you have to do first.