Far Cry 2

This mission is one of the later story missions in the Northern Territory.

Once you're assigned the mission, make sure you're stocked up on health and ammo, then head north out of Pala in a boat.

Stick to the rivers until you get nearly all the way to Goka Falls. Once you get to the small building on a jetty/pier just before the falls, get out of the boat, and take the path up the hillside on the *opposite* side of the river from that building. At the top of the path, there is a rope bridge across the gorge. Prosper Kouassi is in the building on the other side of that bridge.

If you have a sniping weapon, you can stay on the far side of the bridge from the building. Most of the enemies will make their way to the other side of the bridge and you can pick them off one-by-one. Crouch in the grass to stay hidden, and make it harder for them to hit you. Long range explosives (rocket launcher, granade launcher) can also come in handy here.

Once you've thinned their ranks, sprint across the bridge, take out the last few stragglers, then head into the building. BEFORE you kill the target, heal up and refresh your supply of syrettes from the first aid box.

Once you kill the target, there will be a *lot* more enemies turn up. You have a few options here:
(1): Hole up in the building and let them come to you - watch out for them throwing grenades into the building. Take them on as they pass by a door/window. Once you've killed a few, you can start popping out of the building, squeezing a few shots off, then going back in for a breather.
(2): Make a dash for the bridge and jump off the middle of into the river below and swim for it!
(3): Go out of the building, and turn right towards the falls. There's a hanglider on a rock outcrop over the river - take it and fly right out of there.

The acheivement will pop once you leave the Goka Falls area of the map (i.e. once you move out of the zoomed-in section of the map).