Here is the full list of all 50 Alien: Isolation achievements. It takes around 25-30 hours to unlock all of the achievements on Windows.
Cause the Alien to retreat by using the flamethrower
Use the flamethrower
Turn off the beacon
Complete the seventh mission
Detect 30 targets with the motion tracker
Perform 10 successful hacks
Complete the sixth mission
Kill an Android
Use the stun baton
Complete the fifth mission
Access 10 different rewire points
Use the vent system 20 times
Complete the fourth mission
Knock down a human or stun an android with a non-lethal attack
Escape from android combat without taking damage
Use the revolver
Complete the third mission
Encounter the Alien in Sevastopol for the first time
Complete the second mission
Collect an ID tag
Construct an item
Complete the first mission
Collect 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
Kill 10 humans
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 fifth mission without being killed by the Alien
Complete the sixteenth mission
Complete the game without dying
Complete the seventeenth mission
Complete the eighteenth mission
Use the bolt gun
Kill an android using only the maintenance jack