To acquire the goggles, you will first need to get into a couple fights with other bikers. The chainsaw makes short work of them (see the achievement A Fistful of Fertilizer). First you will need the board weapon. This one is carried by a larger biker on the Mine Road. Once you acquire that, you will need to ride around the Mine Road until you find a fight with a lone Cavefish biker. Equip the board and attack him. Ben will smack him in the face and he will crash. Ben will then get the goggles. After that, use the option to equip the goggles. Ben will continue driving the Mine Road and you will be in the goggle view mode. At some point, an indicator saying "Cave" will appear and you will get an option to exit. Click the button to exit and you will get a small cut scene of Ben driving into the cave. At this point the achievement pops.