30 Kills: PAK-80 Trophy in Uncharted 3: Drake's Deception

The PAK-80 is found in only 2 places in the game and is the equivalent of the GAU-19 in Uncharted 2. It is a heavy duty, rapid fire machine gun which slows you down as you wield it which leaves you vulnerable to attack. It can not be taken with you either as you automatically drop it whenever you try to grab something like a ledge so kills are restricted to the area you pick it up. On the up side, it is a beast and can mow down any enemy in mere seconds but just be careful at it literally eats up the ammo. Below are the two places it is found:

Chapter 14 - Cruisin' for a Bruisin'

As you begin this level and ascend the cruise liner to the second tier externally, you will go through an area on deck surrounded by containers. A heavy armoured brute carrying a PAK-80 will join the confrontation and he must be brought down quickly with carefully placed headshots. For the best cover, jump onto the container in the middle of this area and then into the gap between the two adjacent ones and pick him off from there. Once he's dead, jump down and grab the gun and proceed to waste anyone else around including a few bad guys who jump down from the tier above you. There won't be many so restart the checkpoint when the only other guy is the one taking potshots from cover above you.

Chapter 20 - Caravan

This spot is probably the best one of the two but killing the grunt who carries the gun can sometimes be a pain. After you complete the horse riding part and you and Sully are abandoned by your horses, head forward through the sandstorm and veer off to the right, stealth kill the guy walking away from you and he will drop a T-Bolt. Pick it up and fire off a round into thin air, this will make the brute chase you. As he comes, try to take him out with a headshot, it can take a couple of tries so bear with it. Once you drop him you can pick it up and take out the other 3-4 guys in the area with the PAK-80. Now proceed into the next area which is heavily populated with enemies, take out a good 5-6 bad guys on the right and left of this area and restart checkpoint. You will spawn with the PAK-80 right next to you so thankfully don't have to headshot the grunt again just to get it and you can repeat the kills as before. Restart the checkpoint as required.