Crank bots are cyborgs with brain in there bodies or human loking people with purple shooting lasers. Can be found anywhere. But best spot to grind- Pres start button to pick up map and A button to zoom out. City area (grey color on the map)-find staith streeth connecting east and west cide of city. On that street are 9 of those cranck droids. Kill them,go out of the room,go back in so they can be spawned back and kill them again. Repeat. Achievment