So Alien: Isolation is coming out soon and I was considering pre-ordering it on Steam (my preferred way to buy games) so I can get the bonus DLC, but I read that there is a 2nd DLC chapter if you pre-order from Gamestop. So I was wondering if I pre-order it from Gamestop, do they just give you a Steam key? Is it just a normal execute file you have to open by itself (not through a client)?
If it's not a Steam key, would I be able to add the game to my Steam library and get achievements and all that?
Built my first gaming PC about a year and a half ago and so far have only used Steam, so I'm totally unfamiliar with buying PC games retail and how it works. Any clarification would be greatly appreciated. Thanks for reading.