Killzone: Mercenary - Mission 5 (The Package): Precision Contracts (walkthrough)

Contract loadout requirements: STA-11

The mission requirements:

• Avoid civilian deaths
• Headshot 25 enemies with the STA-11
• Extract within 3 minutes of leaving the bar
• Achieve a kill while on a zipline

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Avoid civilian deaths

Fairly easy to complete since most civilians will run away the minute anyone starts shooting. The one you at least have to worry about is the start of the mission one where you have to prevent a civilian from being kill from a helghast police.

Headshot 25 enemies with the STA-11

Different player have different skills set, but all in all this SMG require (at least to me) to have you go up close and personal to get any high chance of headshot. There are PRO and Con for this SMG, which I will not state but I did developed a simple tactic base on my personal opinions around that PRO and CON. That tactic is either lurk the enemies to restricted locations of my choosing to restrict their movement and pick them off or go to where the enemies are while they are shooting at you and hiding behind stuffs. Depend on the difficulty level you playing on, please remember to wear more armor or something to protect yourself.

You should or I hope you should be able to finish this by the time you leave the Market.

Note: When I did this objective on all difficulty, the majority of my kill were done at the Market. The rest of the kills were done at an earlier locations.   
  

Extract within 3 minutes of leaving the bar

The timer start the second the door open for the heavy to walk into the bar until you leave on to the intruder.

Before the door open, make sure you have the Van-Guard: Arc Missile ready along with your choices of Armor. Activate the Arc Missile when the door actually open and run. The Arc Missile will be activated and protect you most of the way until it run out of energy. The rest depend on the armor you wearing and how fast you can reach to the "bar window" while only shooting anyone that blocking your way. Once you touch the "bar window", enemies will stop shooting even if you're surrounded by enemies.
      
You will then zipline down from there, where you have to fight enemies while you wait for your pick-up. You should have plenty of time as long you run in the area before you zipline.
      

Achieve a kill while on a zipline

 

Although you will zipline twice in this mission, only one will actually allow to shoot as you zipline across  and that would be the one at the "Outpost", the place with the mount gun and sniper on the opposite side. 

Before you zipline across, make sure you arm yourself with either a VC9 or VC11. Your target will be the mount gun area with the purpose of a splash damage kill from either of the above mention weapons. This zipline is too short for a gun to have an actually perfect aim shot kill so we going for splash damage kill.