Item description:

A "good ending" is in the eye of the beholder, of course. Previously, this might have been called a "good karma" ending. But, since karma doesn't exist in Fallout 4, this ending is best described as putting the Commonwealth into a state of strong stability for all of the major players (except for the Institute...those slaving, murdering bastards get nuked).

This ending keeps all the major factions alive and happy with you. You are a high-ranking knight in the Brotherhood, a major asset of the Railroad, and (of course) the leader of the Minutemen. Side quests for all three factions are open to you along with various post-event quests.If your idea of a "good ending" is everyone dead and a giant pile of pillows that you stole from all corners of the Commonwealth placed in one room guarded by nukemines and missile turrets, then...yeah. This won't be the best "good ending" to suit your tastes. But if you want all companions from the Minutemen, Railroad and Brotherhood to be happy and alive, with nobody from those factions murdering each other in the streets, then this is the ending for you!The steps to achieve this ending are listed below.