LIGHT EM UP
Use the flamethrower
Caused the Alien to retreat by using the flamethrower
Alien Isolation LIGHT EM UP & BACK OFF – Achievement / Trophy Guide
If you have the Ripley edition of the game you can get this achievements/trophies right at the beginning of the Crew Add-on. Your first objective is to get the flamethrower. After that you will climb down a ladder and have your first chance to use your new toy on the alien. If it doesn’t show up, sprint for a few steps and it should come for you quickly.