Turn Traitor Achievement – 진포지 1 – 돌연변이 유발 물질

Turn Traitor Ally yourself with the Takers.

How to Unlock Turn Traitor Achievement

Join up with the Takers faction, who you will most likely meet last. They will ask you to kill a bunch of Sholai interlopers hiding in some caves to the East. This will deprive you of some allies later on in the game.