Far Cry 3 - Unheard Achievement

Liberate an Outpost without triggering an alarm

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This is easiest with the first few outposts you come across. You must stealthly take out all enemies to do this. You will need to make sure the enemy does not spot you at any time. If one of the guards shoots at you it will count as the alarm going off.

You will need to find an advantage point using your camera to tag all of the enemies in the area. Once they are all tagged you will be able to keep track of them all, go around the camp distracting each enemy using your rocks, once they get close take them down.

You will not be able to use your gun for this, you will be too easy to spot.

Clearout the camp and unlock the achievement.