Full list of all 50 Alien: Isolation achievements worth 1,000 gamerscore. It takes around 40-50 hours to unlock all of the achievements on Xbox One.
Caused the Alien to retreat by using the flamethrower
Used the flamethrower
Turned off the beacon
Knocked down a human or stunned an android with a non-lethal attack
Killed 10 humans
Completed "Seegson Synthetics"
Performed 10 successful hacks
Used the stun baton
Detected 30 targets with the motion tracker
Completed "The Outbreak"
Completed "The Quarantine"
Used the revolver
Completed "Seegson Communications"
Escaped from android combat without taking damage
Accessed 10 different rewire points
Killed an Android
Completed "Encounters"
Encountered the Alien in Sevastopol for the first time
Used the vent system 20 times
Completed "Welcome to Sevastopol"
Collected an ID tag
Constructed an item
Completed "Closing the Book"
Collected an archive log
Complete the tenth mission
Complete the eleventh mission
Complete the twelfth mission
Complete the thirteenth mission
Complete the game on the hardest difficulty setting
Complete the game on any difficulty setting
Collect all ID tags
Collect 10 Nostromo logs in the main campaign
Contact your team and escape Comms without being attacked by an android
Use the shotgun
Cause the Alien to retreat using a molotov
Complete the game without killing any humans
Navigate Reactor Maintenance without dying
Complete 10 minigames successfully
Construct one of each craftable item
Collect 100 archive logs
Get killed by the Alien 100 times
Complete the fourteenth mission
Complete the fifteenth mission
Complete the sixteenth mission
Complete the seventeenth mission
Complete the eighteenth mission
Use the bolt gun
Kill an android using only the maintenance jack
Complete the fifth mission without being killed by the Alien
Complete the game without dying