Ending 1: 

• Leave before the story-telling takes place when given the option.
• Follow Jack and Jill when asked.

Ending 2:

• Leave before the story-telling takes place when given the option.
• Choose to return to the Neverplace

Ending 3:

• When you meet Peter on the train, agree to help him.

Ending 4:

• When you meet Peter on the train, do not help him.

BONUS - It is worth choosing to stay with Suraj and also following Hakon when the option appears, as some important lore is revealed at this point :)