Finish the 1st chapter to unlock Patty. Patty is sort of like Nadia
Finish the 2nd chapter to unlock Rhombus. Rhombus is sort of like Cyrus
Unlock Vault Dweller
Finish the game to unlock Vault Dweller. Vault is sort of like Cyrus
The large Glowing ghoul in Los, when killed, spits out the Slugger, a club-style weapon that provides more damage then any up to the plasma saw. To get at the Big Ghoul, kill all of the ghouls on the level, including those behind the sections of wall in the alleyway. You may only have to kill the ghouls in the alley, but no harm in being thorough. If you do it right, a boss health bar will pop up with the things name on it.
Find him, kill him, and claim your club.
Advanced Power Armor
Wonder Why you can't buy it? When you are tromping about the vault, you will come upon a series of rooms that have a boss in each one, a total of maybe, four rooms. super mutants night kin etc. Each room has a console that allows
you to purchase a rob buddy for your destructive pleasure. When you get to the room that has mazelike walls, super mutes with tesla cannons and big boxes on metal beams, crawl under both sets of boxes and pick up the ingredients for your very own suit of Adv. Power Armor!
Red Ryder BB gun
When Vidya tells you to kill all the raiders and get into the warehouse, try to save all 37 townies. The Vaultdweller will fork over this weapon inside the warehouse. It inflicts 1- 101 damage and has infinite ammo.
The meat cannon
At the save machine on the bridge (in Chap.2), level before going down to the docks, make a 'leap of faith' straight past the machine into space. You should land on an invisible walkway. Walk straight to the floating pipes and concrete to an area containing a lot of Ghouls with shotguns in front of an ice- cream truck and a chest containing the meat cannon. This weapon dishes out massive doses of meaty death. and has unlimited ammo
When in the second Chapter in the city of Los, in the upper docks, where the Rad-pools are located. At the north end of the area will be two Rad throwing gouls Kill them by shooting the through the wall using an energy weapon. If you kill both of them a boss will appear ,Kill him and you will have a secret update "Secret Item now available" not sure what this secret Item is yet but you could help us all.
Beating the Mayor
I found that the mayor is a boss which is especially hard to defeat. the best way I could find was to use a desert eagle, a torch, and some homemade bombs if you have any. set the bombs as mines in the middle when he is off to the side and use the desert Eagle to shoot him without getting close once you run out of bombs. the torch should only be used against the raiders that come in at you. If you do find yourself in close quarters with the mayor quickly take a few swings at him with the torch and light that sucker up!
All Characters, Extra Movies& Apocalyptic Difficulty
In order to unlock all characters you will have to finish the 1st chapter with each character or just finish all 3 chapters with any character under any difficulty and the 2nd way is better as finishing a chapter will unlock a new character and your character will be upgraded and strong. Once you finish the game you will unlock all characters, extra movies and the Apocalyptic difficulty
"GLITCH" dont waste your time to get bonus
When you are in vault 13 you will come across a series of lasers with a switch at the end. It appears to be very difficult to jump, or impossible in two player because there are two switches and both players have to make it. But I found if you get next to where the laser stars you can run right through. The second set can be made in one jump. This is more beneficial in two play mode but it might work on all lasers.
The code to unlock the middle door (shelves) in the library is 872. In binary this is 001011011. 0 means put shelf down, 1 put it up. For your trouble you'll get about 4000 caps and a heavy machine gun.
When you first start a new game of fallout it can be hard to get money before heading into the warehouse, so I have found that the easiest way to get money is to sell anything you start with that doesn't help you. EG. with Cyrus when you start you have glasses, boots and gloves none of which have any armor value so instead of keeping them sell em an get something useful like ammo. NOTE: all characters start with something they don't need. also if you almost have enogh for something such as a desert eagle but not quite sell another pistol like the berretta because once you have the eagle you wont use the berretta anyways.