In order for you to play Alien: Isolation on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
Ubuntu 14.04 64-bit, SteamOS
Processor (CPU):
2.6GHz Intel i3 or equivalent
Memory (RAM):
4 GB RAM
Graphics Card:
Nvidia 6xx series (driver version: 355.11)
Storage:
35 GB available space
In order to play Alien: Isolation on Linux with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
Ubuntu 14.04 64-bit, SteamOS
Processor (CPU):
3.2GHz+ Intel i7 Quad Core
Memory (RAM):
8 GB RAM
Graphics Card:
Nvidia 970 (driver version: 355.11)
Storage:
35 GB available space