Creating atmospheric tension isn't exactly easy. If it were, every survival horror game would be a hit. There are several elements that have to be closely tended to, one of the most important ones being sound.
In making Alien: Isolation, Creative Assembly made sure to put a lot of emphasis into the sounds and music of the game. Watch as key developers talk about working with a London symphony, and explain how the sound engine allows for dynamic shifts depending on what the player and the Alien are doing. Then, watch a lady stomp vegetables, because that also happens.