Here is the full list of all 7 Hunted achievements.
The base game contains 4 achievements, and there is 1 DLC pack containing 3 achievements.
You killed one of the final bosses (could be under main station or on a different one)
Play the game for the first time
you got in then got out of your first space ship
You know what you found
You visited the OS-200 Cave!
You found the Secret Final Boss Location