Killzone: Mercenary - Mission 4 (Diplomatic Incident): Covert Contracts (walkthrough)

Contract loadout requirements: Ghost, STA-7

The mission requirements:

• Achieve 15 Ghost Generator kills
• Kill 30 enemies with STA-7
• Stealth to the ambassador's office
• Get into the lobby avoiding the main entrance

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Achieve 15 Ghost Generator kills 

There are plenty of enemies to kill on this mission.  

Kill 30 enemies with STA-7

There are plenty of enemies to kill on this mission.
 

Stealth to the ambassador's office

This apply from the start of the mission until you reach Ambassador's office.

Below is simple version walkthrough on how to do it.      
      

Get into the lobby avoiding the main entrance

 

This apply only at the start of the mission. Uses the ladder on the left side of the building.

Below is simple version walkthrough on how to do it.
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Time for some stealth and stealth kills, remember stealth is all about not being see nor heard.

Embassy Main Entrance and Lobby Area:
This is the start of the mission, you can eliminated all the enemies outside the building for the kills or just bypass them by climbing the ladder on the left side of the building. Either way, you still need to climb the ladder on the left side for the "Get into the lobby avoiding the main entrance" objective. You then eliminated the officer on top before you hack a door on the left near the top of stairway to gain entrances to another room. Eliminated the two enemies in this room area and then proceeds to the next area.

Top of the courtyard and the room next to it Area:
You going stealth kills everyone here to be safe. Start with the one on the outside, then move on to the next room. After that move on to the next room and finally that same room but upstair.

Then you go through the door and kill the last enemy with a rocket. Now you free to proceed to the ambassador's office. If you see red alerted enemies on the right side of the your radar when you were killing the enemy with the rocket. You are still fine because they are alerted not by you but are fighting the ambassador's bodyguard so you still safe within the objective of stealth.

Just go and enter the ambassador's office and you be finish with "Stealth to the ambassador's office" objective.