Red Faction

Story-related. Cannot be missed.

After you take Gryphon for a ride in your Aesir fighter ship, you will go down to the Trash Facility Plant. Here you will find a big robot that wants you dead, the Ultor Personnel Suppressor. Attack it until Hendrix says "You need to lure the bot to the disposal pit and open it from the control room, Parker". Once he says this the combot will follow you down to the disposal pit, head down there and climb the ladder, then interact with both buttons to open the pit and activate the giant fan. When the combot goes over the pit, he will be pushed in and you will get your trophy. If you need to refill your health, armor and ammo, there's plenty in the side rooms and the area above the room where the combot spawned.