There is no 'way of doing it'. Your either good at the game or your not.
Complete the levels 'Black Tuesday' and 'Hunter Killer' on Veteran difficulty.
Hell no - Complete the game on the hardest difficulty - as well as the Spec Ops Missions on the Hardest difficulty to gain 100% game comepletion
Do you mean "Beating the Game?"
Seriously? Try an easier difficulty, shot all the enemies before they shot you, evade grenades, etc. Complete the objectives.
That's a technical difficulty...... :/
Finish the campaign
The Call of Duty Wikia has a complete list of the Call of Duty Black Ops weapons from the related link
The best may be complete the game on veteran on call of duty 2, as this gives you the full 1000g.
By beating the campaign.
poo on your face
you need to complete operations
You have to complete the campaign on any difficulty and then you can kill some dead guy ok that guys retared.... to get a MODED version of zombies use modio, you need a usb memory stick