⠀⠀⠀⠀⠀    All the steps described below must be followed by all the players. Not only the host.⠀⠀⠀⠀⠀    

Seems like the Windows Firewall blocks the traffic which come from another devices through this app, so we need to add an exception:

1) First of all, press Windows + R and write control.
2) Click on Windows Firewall.



3) Click on Allow an app or feature through Windows Firewall.



4) Look for an app called LÖVE 0.9.2 (which is the framework where Move or Die was made). Click on Change settings and make sure to check the three checkboxes.



Here is a video guide you can check if you got lost in some part:

Seems like the local network service is not working properly in the current build of the game, so we need to download a depot (I mean, an old version of this game) in order to fix this.

5) Create a new empty folder in your desktop and rename it as you want.
6) Go to your Move or Die installation directory and move all the files from there to the folder you have made seconds ago.
7) Press Windows + R and paste this:

steam://open/console

8) In the Steam client now there is a console tab. Paste the following string in the input bottom bar:

download_depot 323850 323851 8847522690012043280

9) Once the download is complete, you will see something like this:



Press Windows + R and paste the route throwed in the console.

10) Finally, move all those files to the now empty Move or Die installation folder. Launch the game normally through the Steam library. If you see something like this at the beggining...



... congrats, you have successfully installed the depot. Dismiss that message and close the game.
If you got lost at some point, here are some extra resources maybe can help you:

https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=889624474
Achievement Scouts > Informational Thread > Section about depots.

In order to emulate a local network, we need a VPN. I highly recommend Hamachi since Radmin didn't work for us.

11) Download and install Hamachi. Create an account (if you don't already have one).

Note: The step 12) must be done only by the player who want to host.

12) Create a new network. The ID and the password of the network doesn't really matter. Just keep note of them to share with your friends to let them join your network. You may also want to share with your friends your IP address. Right click the numbers next to the power button > Copy IPv4 adress.

Note: The step 13) must be done only by the other players who are not hosting.

13) Go to the Move or Die page on your Steam library. Click on the gear icon > Properties... and under the LAUNCH OPTIONS section, paste the following:

+connect IP

Where the IP are the numbers you copied in the previous step.

14) The host of the Hamachi network must launch the game first. Go to Play locally > Local Area Network > Host LAN Game. Now the other players can launch the game and will automatically join your room. Once all the players fills the room, the achievement will pop for the host (and only for the host).
The steps 12), 13) and 14) must be repeated one time for each player who want the achievement.
One last time, if you got lost somewhere, you can watch this video (skip until 03:17):

https://youtu.be/t_vlEITiOmo