Sniper: Ghost Warrior 2

The first point to note is that thsi acheivement is unmissable and will come with natural story progression. You will unlock it after completing Act 2, Mission 2, "And Justice for All".

*SPOILER*

At the end of the level, you come to the top of a building, overlooking a courtyard where the major is. Via your binoculars look at the troops in the courtyard, and the major will exit a building and walk towards them.

When you go to snipe him, all hell breaks out. First of all Maddox tells you that you need to kill 3 snipers. Moving left from your starting position round the wall, there is a sniper on the roof of the building to the left of the main building. Second, there is a sniper in one of the windows of the main building. Thirdly there is a sniper of the roof of the building to the right. The building ones are tricky to spot as they are laying down. Playing on expert, what i did was inch out from behind the wall, let them start to spot you, and then duck back in cover, noting where the point of the "being spotted" red circle started, and using this as a reference point. Repeat this technique, knowing roughly where they are until you spot them.

When you have killed the snipers, about 6 soldiers rush towards the cars below, and start firing. Whilst they are easy to see, they do do a lot of damage, so employ the same technique of inching out, shoot, then straight back into cover. There is a health pack at the back of this room, plus a secret if needed.

After this, the major runs into the building - he is tricky to hit, mainly as he continually shifts windows. Listen to the advice of Maddox, as he tells you exactly where he is. On my go, he started on the right side, then disappeared and moved to a left side window. When I played, there was no wind, so it was just a case of aiming for his head, to register a body shot kill.