After completing Confounding Light, the next council mission will be Gangplank. This mission takes place on a large Battleship, the layout of which is the same as the Battleship encountered in the late stages of the vanilla game. The mission requires you to deactivate 6 engine components, this is done by moving to an adjacent title and manually deactivating it or by using an explosive weapon.
This mission will have a range of enemies including Sectoids, Thin Men, Cyberdisks and Mutons but overall shouldn’t prove too difficult as there aren’t a large number of enemies and most of the time you will engage them one or two at a time. Once the 6th component has been deactivated, the achievement will unlock.
NOTE: You aren’t required to bring Zhang along on this mission in order to unlock the achievement.