Here is a guide for all endings and secret achievements. I found some pretty tricky.  

100% Endings Guide for DLC Achievements 

This Guide Will show you how to obtain all trophies and endings in part 1 and the staff only DLC in under an hour !!! MAJOR SPOILERS FOR PART 1 AND STAFF ONLY DLC !!!! (this is my first guide for a game i genuinely enjoy and im making this so people dont g... 

Step by step walkthrough with screenshots and all achievements. All achievements will be listed in places along the way where they can be obtained. Attension! - getting endings leads to a restart of the level and all actions will need to be started from th... 

*SPOILERS ALERT* Here is a small guide that will help you to find numbers for a code lock on the exit door.