The Explosive Surprise achievement in Far Cry 5 requires you to kill 5 enemies using the Saboteur perk, which causes vehicles to explode. Here’s the best way of going about this. The Saboteur perk is available on the fourth line down on the top of the perk tree. It cost 7 perk points and explodes vehicles after 10 seconds once used. To get the achievement, head to the middle of John’s Region to the Red’s Farm Supply. An enemy car will appear here with two people inside. Kill the driver and use the skill to sabotage the car. Keep the cultist near the car by kiting him around until it explodes. Once down, repeat the process by fast traveling to the area again. Do this 5 times to get the achievement.