Put the sun on the machine in the Barrens in the factory near the residence where Prophet-Bot is and it will give you the achievement..

Turn on the generator in the residence where the Prophet-Bot is, then use Z and interact with the generator. This will shock Niko and give you the achievement.

Use all available items to trade with magpie in the Valley
https://youtu.be/nZMcUFKkMPM

You have to do the lamb puzzle without restarting it again. Here is a tutorial.
https://youtu.be/bmT8sF-aR2Y

When you arrive at the city and leave the library towards the end of the game, Niko will say that he is hungry. You can decide whether or not to say yes and go to the city cafeteria and talk to the NPC. This will open some dialogues and you will get the achievement.

:c

In the city, enter the apartments and in one of them you will find a machine, interact with it and Niko will climb on it and you will get the achievement.

Niko In The Roomba

You must trade a piece of wool with Magpie, and when he offers you the ink, you must say no. This will make another offer: a lamb's shirt. You must keep that shirt until you reach the city. It's on a wall where there's a ram painted orange. You must put on the shirt, and that will open the wall, allowing you to pass.

The wall

You should only read books in the city library, some are in the room where George is in case he doesn't give you the achievement.

You must read those yellow borders

You must plant the Maize seed in the city, you must get soil from Mason (the boy found in the apartments who has plants) and you must also use the water sample obtained in the Valley. (Um, you must also use the rapid growth water pill that you get on the ground floor of the city)

Hehe, you should put the seed here :3

Complete the game without closing it once. It can only be closed in the mandatory parts, such as when Niko sleeps and at the end of the game.

You must complete Solstice once and enter the three dots in the start menu, this will open a dialogue between Niko's memory, allowing you to play it again as Niko's memory.

This is the end of this crappy guide.

Hope you enjoyed it! I’ll be answering some comments :3
Hope you manage to platinum the game.
Thanks!

(The uploaded videos are in Spanish because this guide was re-uploaded. Just ignore it. The text doesn't matter.
Sorry for the inconvenience.)