You can get this very early on. The junkyard is in the far north of Portland (The brown and white smudges on your map)
There’s a little parking area outlined by car tires. Park up there and the junker should take over.
People have reported this doesn’t always trigger the trophy right away. If you have problems, I’d suggest one of two things;
Collect the ‘i’ marker that explains the crusher, then try crushing a vehicle.
Get yourself a one star waned marker, then drive to the crusher to ‘dispose of the evidence’