no u need mods
If you are referring to the Alien Blaster, you need to take the trait 'wild Wasteland' and head North past New Vegas, near the Tumbleweed ranch (a bit East of that). If you mean the orbital laser, you need to finish 'That lucky old sun', set the power to ARCHIMEDES II and get the rangefinder in Freeside.
You don't need a passport to get into freeside.
If you've been sold a copy of Fallout New Vegas with no product code, you need to contact the person you got it from.
Around 50
you see them around the wasteland and in places such as tenpenny tower or megaton (also big town but you need to do a quest first)
You will require internet to install the game; as it is on steam. Apart from that it does not need to be connected to the internet.
You need 50 Sarsaparilla Star Caps to proceed to the next part of the quest.
You need to have the 'Lonesome Road' DLC installed, the Canyon Wreckage is the starting point for the DLC.
If you want the Hidden Vally Bunker Key, you need to pickpocket one of the Members of the brotherhood of steel
Undead nightmare is just red dead redemption but whit zombies. New Vegas 100%
You need the lightsaber video effect.
If you go to "Fallout.wikia.com" you can search their Fallout:NV section, which has the info you need (since i can't remember off the top of my head)