Image: Bend Studio / PlayStationOfficial screenshot from Bend Studio / PlayStation.
Infestation Exterminator is a Silver trophy for clearing every Infestation Zone. You need to burn every nest in each zone, and nothing is missable.
Burn every nest in each zone with a Molotov or fire. Use the Infestation Exterminator storyline to track remaining zones.
Clear Infestations in daylight, when fewer Freakers roam. If the trophy fails to pop on the last zone, reload an earlier save and clear it again.