Do you want a guide on how to get Heath's special ending?
First, you have to get Heath's ending by siding with golgotha and declaring andrei as the leader in the end. I strongly advise you to play as a golgotha yourself for this ending while choosing heath as your mentor, since the golgotha's affections are notoriously hard to raise.
Then go to the extras to check if Heath ending #4 has been unlocked. If yes, proceed to start a new game as an iscari and pick Heath as your mentor.
After that, PICK ALL THE CHOICES HIGHLIGHTED IN RED. The dark maroon may be hard to see, so do pay attention haha.
Then you get to see your darling boy reveal his true colors (not that he hasn't from the beginning tbh)
For all the other ending, just choose to side with the 1.Saorise 2. the Rebels