1. Treat Jun well (don't call her a bad name for example), protect her when time is come and don't sell her to BigDaddy 2. Complete the church story on second ending 3. Not drop the starving or sanity to zero 4. And don't get many medicines This things are help me don't get any of the endings
One of the shurch endings open the way to ending where Jun leaving. In the main menu you may see which endings you've got, in the chapter of achivments to be exact. You can drop the church story in the website "iamacheater"