MAIN MISSION #20 - Friends Reunited
EMPLOYER: Trevor (Cheng)
PREREQUISITES: MM #19 (Crystal Maze)
1. Headshots: Kill 5 enemies with a headshot.
2. Mystery Gift: Destroy the trailers without being detected
3. Unmarked: Complete with minimal damage to health and armor.
4. Perfect Gift: Destroy all trailers at once.
Go to Trevor's house to start this mission. Drive to the trailer park and take out your sniper rifle; shoot the first guard straight ahead (and make it a headshot). The idea is quite simple: plant the sticky bombs at the indicated trailers without being detected (you can still finish the mission when you're detected, but 100% completion is out of reach). Two bikers will soon make their way off; if you want to you can ignore them, but shooting them through the head allows for a perfect score.
There are two other bikers standing still down the road to the right/east side of the trailer park that you'll also want to take out with headshots. Then there's the arguing couple nearby the trailer in the middle; take out the guy with a headshot as well.
Once you've placed all sticky bombs, destroy all trailers all at once. After this you'll only have to make your way to Los Santos with a short scenery stop on the way.