Alien: Isolation

Complete the following achievements to unlock Xbox Live Gamerscore points.

Awake (10 points): Complete the first mission.

Welcome to Sevastopol (10 points): Complete the second mission. (Video)

A Hunt Begins (10 points): Complete the third mission. (Video)

You Shouldn't Be There. (10 points): Complete the fourth mission.

How Do You Feel? (10 points): Complete the fifth mission. (Video)

Caught in the Trap (10 points): Complete the sixth mission. (Video)

An Outpost of Progress (10 points): Complete the seventh mission.

Shock to the System (10 points): Use the stun baton.

Bait (10 points): Complete the tenth mission.

Hazard Containment (10 points): Complete the eleventh mission.

A Synthetic Solution (10 points): Complete the twelfth mission.

Consultation (10 points): Complete the thirteenth mission.

Survivor (100 points): Complete the game on the hardest difficulty setting.

Ripley, Signing Off (50 points): Complete the game on any difficulty setting.

The Missing (10 points): Collect an ID tag.

The Taken (40 points): Collect all ID tags. (Video)

Archivist (40 points): Collect all Nostromo logs. (Video)

Light 'em Up (10 points): Use the flamethrower. (Video)

Just out of Reach (40 points): Contact your team and escape Comms without being attacked by an android. (Video)

Use With Caution… (10 points): Use the shotgun.

Every Bullet Counts (10 points): Use the revolver.

Self Defense (10 points): Kill 10 humans.

Not a Scratch (20 points): Escape from android combat without taking damage.

A Perfect Organism (10 points): Encounter the Alien in Sevastopol for the first time.

She's in the Vents... (20 points): Use the vent system 20 times.

I Admire its Purity (20 points): Detect 30 targets with the motion tracker.

Build to Survive (5 points): Construct an item.

Mercy or Prudence? (50 points): Complete the game without killing any humans.

Seegson Security Bypass (10 points): Perform 10 successful hacks.

Seegson Systems Expert (10 points): Complete 10 minigames successfully.

Power Games (10 points): Access 10 different rewire points.

A True Engineer (20 points): Construct one of each craftable item. (Video)

A Record of Disaster (10 points): Collect an archive log. (Video)

Voices of Sevastopol (40 points): Collect 100 archive logs.

Fault Detected (20 points): Kill an Android.

Throwing the Switch (10 points): Complete the fourteenth mission.

The Message (10 points): Complete the fifteenth mission.

Transmission (10 points): Complete the sixteenth mission.

Free the Torrens (10 points): Complete the seventeenth mission.

End of the Hunt (10 points): Complete the eighteenth mission.

This Should Work (10 points): Use the bolt gun.

My Turn Now (40 points): Kill an android using only the maintenance jack. (Video)

Hide. Run. Survive. (40 points): Complete the fifth mission without being killed by the Alien. (Video)

One Shot (100 points): Complete the game without dying.

Additionally there are six secret achievements.

Retreat From Fire (20 points): Caused the Alien to retreat using a molotov. (Video)

Back Off (10 points): Caused the Alien to retreat by using the flamethrower. (Video)

Stunned (10 points): Knocked down a human or stunned an android with a non-lethal attack. (Video)

Mind Your Step (20 points): Navigated Reactor Maintenance without dying. (Video)

100 Times Too Many (5 points): Killed by the Alien 100 times.

Not the First (10 points): Turned off the beacon.

*There are 6 secret achievements. show

Enter Sevastopol station in mission 2. After checking in with the android, explore the station to find origami foil unicorns in various locations . This is a reference to another Ridley Scott film, Bladerunner, where Harrison Ford finds one at the end of the movie.
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Play mission 6 to easily get killed at the start before entering the chambers.

• Using the stun baton on human target counts as a kill. Avoid using that weapon.
• Using any kind of device (noisemakers, Molotovs, etc.) or having human hostiles shoot you to call the alien counts as a human kill towards "Mercy or Prudence?". Avoid humans at all cost.
  

Play under the Novice difficulty setting. Quickly open the menu before you dying in order to continue. If you actually end up dying, do not load the current saved game. Instead, use the second option to load the previous save. Although this will resume the game further back, it prevents the death from counting.

The hardest difficulty available was added through a post-release patch, and is not required to earn "Survivor". Instead, complete the game under the Hard difficulty setting.