Hitman: Absolution

This achievement is simple like the other tutorial, but less so. You start in Chinatown and are briefed on how to create a contract when you go through the doors in front of you. If you only want the achievement and are not creating a legitimate contract at the moment, (since it is a tutorial I would not anyway). I would choose the brash approach.

I could try to tell you exactly who I marked, but many of the NPCs look alike, which could be confusing. My advice is this, survey the exits of the map. There are two: a shuttered door down the stairs to the right of where you enter and the door to the dumpling shop to the left past the King's pagoda in the center (you have to pass the stone wall). Incidentally, there is a cop guarding the car who will accost you for trespassing near it. Though I did not kill him, you could easily mark him, shoot him in the head, and leave. Quick. Simple. Complete. (His location is always default, unlike many NPCs.)

P.S. If you are able, depending on random crowd density, walk in mark the King and his two guards (or police) in the pagoda. Pull up your instinct menu and press X to point shoot. Mark the marked targets by aiming with LT and pressing RT. Go for heads. When the timer expires, if all 3 die, you will get the Rocksteady achievement. It may help to have a police disguise first.