Mission 1 - Shoot the woman that gets out of the car.
Mission 2 - Shoot the dude that is writing on his computer.
Mission 3 - Just try to shoot the guy with a pistol and you will automatically win, because it will trigger a cutscene.
Mission 4 - Shoot the dog in the right.
Mission 5 - Shoot the dude with a hat that's looking at a map.
Mission 6 - First shoot the dude near the car and then the dude that's peeing, after that shoot the guy that will appear by the wall, but shoot fast or he'll run.
Mission 7 - Shoot the dude with a hat and then the guard that's on the left.
Mission 8 - Click the vent, click the door like thing, and click the signboard and cut the wires in this order: red,blue and green.
Mission 9 - Shoot the guard.

Well this walkthrough was very long, and i hope you like this one, i've taken some time to beat the game.