After finishing the game with all possible endings, I was only missing this achievement. So I challenged myself to do it ASAP because I didn't want to play all the game again and find a way to unlock it. This is the way to do it.

Before you begin set the key for "Toggle Game Console" as you see in the image, you can choose the key you want.

1. Start a new game and create your character (Soldier needs to be your option of choice because you get a gun with 10 bullets, you will need this later).
   
2. Enter the city, then the time portal.

You need to do this steps at the beginning of Loop 1 and then Loop 2.

1. Follow the intended path as seen on the picture, avoid talking or minimize dialogs if someone starts one.
   
2. Once in front of the temple's door, open the console and type go through the temple door and type it again to disable it.
   
3. Go through the next doors opening them with the words below in the following order:
   

Start this loop with the steps of the previous section "Common Steps for Loop 1 & 2"

1. When you reach the white room shoot to Proserpina on the right with your gun and take her crown.
   
2. Then go back to the start portal avoiding the arrows from the furies.

Start this loop with the steps of the section "Common Steps for Loop 1 & 2"

1. When you reach the white room, start to talk with the God. In the next image I put the options when there are more than one dialogue.

Yes that's all, now talk with Al:


and you get the Minimalist achievement:

I want to thank you for all your support and comments. Please don't forget to Like and Favorite this guide.