Based on the decisions you make throughout the game, the ending you get will vary. While other games require multiple play through to get all endings, it’s possible in Deus Ex: HR to get all in one. How?
If you’re aiming for 100% trophy or achievement completion, viewing all four endings is a requirement. While not everyone has a time to play the game four times to get all four endings, there’s a way to get it.
Viewing all Four Ending(s) at Once
When you reach the final room of the game, which is the Broadcast Center in Panchaea, you will have a choice that will pretty much determines what ending you will get. Remember the picking either one will give you the one ending. Save and reload to view the other.
– Broadcast Darrow’s Message
– Let the Facility Self Destruct
The other two ending depends on what choice you pick when you talk to David Sarif or Bill Taggart in Panchea. You will be given a choice as well and by saving and reloading, you can get all four endings in total. To talk to David, he can be found on the room where other survivors are barricaded in the Machine Room. Taggar is located in the locked Server Room. The options you will have to pick will rely on whoever person you would like to broadcast their message.
To get the game to acknowledge that you viewed each ending, let the credits roll or at least skip it then you can reload.Deus Ex: Human Revolution - Get All Four Endings in One Playthrough,