i got it first time on legendary... :S

what ever gave you guys the idea that they were talking about the demo? you can't get the skull on the demo

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I'll kick you in the sack if you complain about rushing. I know where you live.

i did it after another like 15 tryes i finily got it,

1.i put it on easy

2.i added a skull that gives A.I players 25% extra health

.3 killed everything as quick as i could and by the end of it there were 106 grunts

 

hope this works for you, thanks for the help people

 

The best way to do it is too ram the grunt squadrons as the elite normally doesn't die so if you have missed some you can go back and find them with the elite still alive, BUT i did this with Sargent Forges warthog and he always fired his guass killing the elite after the ram so i failed to get the skull in time before the mission ended so DON'T use Forge as he will most likely finish the squad as he drives away just keep him near to the skulls spawn point so he can collect it.

Got i!

 

;-)

But, hehe - could not find the black box in the 3rd mission...and you need so much time with the searching that you get a bad mission time and therefore not a gold medal...so another go through just to get that...oh boy.