This is still a work-in-progress as I wanted to upload clean playthroughs so you don’t have to follow me around before I solve a puzzle. I will also be adding achievements that are not part of the story.
 

Act 1 Walkthrough

The fist Act tells the story of Justin almost and Kloot almost individually. As you can't move items between them, I was capable of splitting the paths into two separate walkthroughs. You will notice that there's an (but significant) portion where Justin was able o have an influence on the robot QP43 within Kloot's current timeline. This is why "almost” is highlighted in this article :
 
 

 
 

 
 
 

Act 2 Walkthrough

 
 
 

Act 3 Walkthrough

work in progress
 
 
 

Achievements that you might overlook

 
A work in progress!
 
 
You should be able reach most of these achievements by simply following the story. But, depending on how you approach a particular character and what you did, you might miss some.
 
 
Here are a few I found that you might not have noticed:
 
 

Trophies are not an achievement!

 
A chicken trophy can be obtained by walking away from the portal, while playing as Justin at every stage of the game.
 
 
You can also walk into the hospital in the future to get another trophy and then walk back out.
 
 

Power-Up: Troll-slayer

 
Click on the laptop that has the bunch of green text while at the Office. Next, select the North () option.
 
 

Power-Up of the Egg-Layer

 
(WIP) When you are at the Office, click the laptop with a bunch of green text. Select the West option (W).
 
 

Power-Up: Bully-Buster

 
Important: Do this before Justin helps his cavefolk ancestor! !
 
 
Ring the bell at the All-is-Well Playground to start the bike-race. This achievement is possible if you do this before Justin's cavefolk ancestor. However, if you first help the ancestor, you won't be able achieve this achievement.
 
 

Snot Popper: Power-Up

 
This one is simple and can be done at any hour. To do this, you need to pop the snot bubble at the cavefolk care at least 3 times in a row (.
 
 

Power-Up: Zen Master

 
Follow the path of the Willow in the Past to A Place in the Shade amid the hedges. Here you can choose how much time you wish to meditate. This achievement can be achieved by selecting the 10-minute option.
 
 
But be prepared: it will take you 10 minutes to complete the task. You might want to grab a cup of tea or something.

 
 

 
 
This is all for Justin Wack and the Big Time Hack Achievements Walkthrough & Video Tutorial hope you enjoy the post. If you believe we forget or we should update the post please let us know via comment, we will try our best to fix how fast is possible! Have a great day!