View Solution

This achievement is pretty straight forward ! Once in the game load up a save from the prison you want to share and hit Esc to get the Main Menu and then:

1) Select Extras
2) Select Prison Sharing (Steam Workshop)
3) Select Current Prison on the top, name your prison and hit "Publish this prison"
4) Wait for a bit while your prison is getting uploaded ! You will see a confirmation and the achievement will pop !