How are you supposed to get this trophy on Call of Duty: Black Ops?

I am re-starting my Call of Duty: Black Ops game and I'm trying to find out how to get a trophy for one of the early boards. It is the Varkuta board where you have to kill all of the enemies on the vehicles, does it have to be set at a certain difficulty to make sure you have all of the enemies, because on Normal I killed everyone on the vehicles, but I didn't get the trophy for it. So, does the difficulty have to be Veteran or anything, cause I made sure to kill everyone on the cars and then blew up the vehicles by gunfire and I still didn't get the trophy.

Please help.
 
is it called vehicular slaughter or something like that?
i found i just had to go through a few times, apparently there was at least one vehicle i missed each time. worst comes to worst check out the helpful guides at ign.com or even youtube. there's tons of guys out there who help noobs of any caliber out
 
Yea it is Vehicular Slaughter, if I go back and try it again, will it cause my current game to change? I'm at the part where you meet JFK and he gives you orders.

I found a couple clips on youtube where it looks like you have to shoot the 6 dudes on the motorcycles before getting on the truck with the turret and then taking out all of the trucks, motorcylces, and even the helicopter.

I just wanna get this trophy because I've gotten the couple before it. Taking out Castro with a headshot, and using three molotov cocktails with the slingshot to take out the structures. This is the only trophy I've missed so far.
 
I think I got this one by accident. Just play through Varkuta until you get it.

Some of these achievements are fucking hard. Anybody get the platinum trophy? I'm
stuck around 60% I think. All the veteran achievements are too tough.
 
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