Fork the Pork Achievement
Fork the Pork10
Kill 6 aliens with the forklift
At the beginning of The Forkstop: Part 2 there will be a forklift on a ledge. Use the panel to lower the forklift to the ground and drive down the corridor. Ram the enemies to kill them and add to the tally. There should be 7 aliens before you have to abandon the Forklift. If you miss this here you can attempt to do this in the room for "Companion Barrel", but it will be less practical.
See "Companion Barrel" achievement description if you need more kills.