The majority of side quests in The Outer Worlds are simple. Speak with an NPC, follow the objectives, done. Make sure when you are attempting a specific quest, that it is selected in your journal. You can only track one quest at a time, so you want to ensure you’re chasing the correct markers.
Slaughterhouse Clive Quest Guide
Speak with Catherine at Fallbrook to get this quest. There is a secret entrance to the facility, in the a waterfall near the objective marker, or you can use the front door. It’s a restricted area, so you need to find appropriate ID if you want to complete the quest in an non violent way. Enter through the secret door near the waterfall and go up the ladder directly in front of you. Then there is another ladder, climb that.
You reach a small room with a door and a patrolling robot. Avoid the robot, wait for it to pass, then sneak in the door.
Follow the stairs down until you reach this area. Take the small gap on the right.
It leads to this locker, the item you need is inside. This lets you stay disguised.
Once disguised, you can use the terminals near all the pigs to increase the vitamin supply to the food by 4000% with [Medical 55]. You get 21k XP, Bits, and a Helm as well as SubLight Salvage and Shipping reputation.