That slaughterhouse trophy is still bugged, it took me over 66k kills for it.
If it helps anyone, grab an outlast contract in t1, cancel it at 85%. Use a grenade launcher with speed cola and phd and spam.
Once the storms closer in run to “extraction mission” and that lets you play for another 30 minutes where you can find turret cards and use the turret when Dr Jansen is on the helicopter