shoot it under 1.30 min to get trophy.to do that go downstairs use hand gun on electric rods switch to rocket launcher and shoot ans many times as you can ...fast
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From an IGN FAQ:
"Stun the damn thing by shooting the petrucite lightning rods on the side of the rooftop. The vanes electrify the whole side (hence the only safe spot for the ATAC is the front of the rooftop) and reset after a little bit. The trick is to hold your fire until the ATAC is to the roof's side. Shoot any one of the vanes to shock the ATAC, then missile it in the face. You should be able to get out about two rockets (manually reload) if your aim is quick. Use the center obstruction for cover."
http://faqs.ign.com/articles/956/956606p1.html

Here's a couple vids that might help. And I stuck a couple of forum threads in the Source box for good measure.
Source(s):
http://www.gamespot.com/ps3/action/killzone2/show_msgs.php?topic_id=m-1-483...
http://boardsus.playstation.com/playstation/board/message?board.id=killzone...

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The biggest problem with the ATAC is keeping it in sight. It flops back and forth around the sides of the roof, and your only cover is that big pillar in the center of the roof. You MUST keep that between you and the ATAC at pretty much all times.

Like what was said above, wait till the ATAC approaches one of the sides of the roof, then take a few shots at one of the electric cells to shock it. The best way to do this is to hit the one closest to the wall when the ATAC is in the corner of the roof. That way, you can keep your line of sight to the cell clear, but still avoid fire from the ATAC. You'll want to pick up the rocket launcher immediately upon entering the battle. As soon as the ATAC is shocked, switch to your rockets and put two into the boss as fast as you can. If you try to shoot at it when it isn't shocked, the ATAC will just dodge you.

After you've damaged the ATAC the first time, it'll start adding rockets to its repertoir of destruction. The ATAC will bounce back to the middle of the roof, then launch four rockets at you as it strafes to one side.

This is key: Watch where the ATAC is going, because right here is where you'll come closest to death (and probably die a few times). You want to keep the pillar between you and as many of the rockets as possible, but you need to also keep your wits about you, as the explosions will kick up all kinds of dust. Being able to keep track of the boss despite being blinded is key to victory.

Three shocks with two rockets each should be enough to take down the boss. If you have access to surround sound or headphones, I'd highly recommend them for this battle. The added bonus of being able to track the ATAC by sound can't be overstated -- it'll keep you alive.
Source(s):
Writing the Mahalo Guides walkthrough.

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I killed the ATAC with a pistol in under 1 min 30!!!

listen to this....get yourself downstairs...get tight to the outside wall of the tunnel at the very end of the tunnel to lure the ATAC.

then when it gets near the electrical pilons. shoot the pilons with your pistol so it stuns the ATAC.

now you have a choice, either use missile launcher to hit it twice.

or do what i did...hit it once with a missile and then get your pistol out and keep firing at the pilons.

it will re-stun the ATAC and take damage off. keep shooting the pilons with your pistol but make sure you reload so you can shoot it as it stops. in order to re-stun the ATAC.

the ATAC will die through the shocks alone. no need for missiles

all the best
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