Public Service Porter Achievement & Trophy
Go to the Junk Dealer facility in the Central Region. There are lots of contaminated cargo pieces next to his facility. Collect one of them, then go to the large tar lake directly south of the Junk Dealer. Equip the contaminated cargo to your right hand (via inventory), hold R2 and Square, but release Square just as Sam is swinging his arm to throw the cargo into the lake and get the “Public Service Porter” trophy.