Found a way to get perfectionist challenges easily . . .

[qwerty321]

For some reason I randomly decided to try and take down a chopper with a sniper rifle. So started shooting and this is the result:

YouTube - Enraged Beard - Black Ops Game Clip

Seems as though shooting choppers can get you the challenges. Yet to try with other guns.

 

[Mr Noble]

yeah i got a challenge firing a full clip of an LMG into a chopper without missing

 

[VivaFathom]

You can thank me for pointing this out in the multiplayer discussion thread yesterday.

 

[taffster5]

How'd you manage to stay alive that long? I always seem to get killed within 2 seconds of the chopper coming in

 

[qwerty321]

Ghost Pro.

nuflo, I posted it in its own dedicated thread so I get the credit.