Liberate Any Outpost Without Triggering an Alarm
Far Cry 4 TREAD LIGHTLY – Achievement / Trophy Guide
The “Kyra Tea Weigh Station” at X:345 Y:379 at the beginning of the game is one of the easiest places to get this achievement/trophy. If you come from the hill side you can reach the alarm easily. Once you deactivate it, you can use all your weapons and don’t have to worry about being spotted. After you killed the last guard the achievement/trophy will pop.