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.
Complete the game on the hardest difficulty setting
Complete the game on any difficulty setting
Complete the eighteenth mission
Complete the seventeenth mission
Complete the sixteenth mission
Complete the fifteenth mission
Get killed by the Alien 100 times
Complete the fourteenth mission
Complete 10 minigames successfully
Use the bolt gun
Complete the thirteenth mission
Complete the twelfth mission
Collect 100 archive logs
Construct one of each craftable item
Complete the eleventh mission
Use the shotgun
Complete the tenth mission
Cause the Alien to retreat using a molotov
Use the flamethrower
Cause the Alien to retreat by using the flamethrower
Turn off the beacon
Detect 30 targets with the motion tracker
Kill 10 humans
Complete the seventh mission
Perform 10 successful hacks
Complete the sixth mission
Kill an Android
Use the stun baton
Knock down a human or stun an android with a non-lethal attack
Complete the fifth mission
Complete the fourth mission
Access 10 different rewire points
Escape from android combat without taking damage
Use the revolver
Complete the third mission
Use the vent system 20 times
Complete the second mission
Encounter the Alien in Sevastopol for the first time
Collect an ID tag
Construct an item
Complete the first mission
Collect an archive log
Collect all ID tags
Collect 10 Nostromo logs in the main campaign
Contact your team and escape Comms without being attacked by an android
Complete the game without killing any humans
Navigate Reactor Maintenance without dying
Complete the fifth mission without being killed by the Alien
Complete the game without dying
Kill an android using only the maintenance jack