There is only one proper ending in Far Cry New Dawn, but you can get an alternative ending to the encounter with Joseph which you could say is the good ending / bad ending.
You’ll have the option to “Shoot Joseph” and you can either shoot him or leave him there, this video goes over both options as well as the final boss fight in Far Cry New Dawn. Whichever ending you choose you can still free roam after the end of the game.
There are 2 endings in Far Cry New Dawn:
1 – Shoot Joseph at the end of the game
2 – Let Joseph live at the end of the game, just don’t do anything when he wants you to kill him