Crystal Maze

For the Headshots requirement, use the sniper rifle with a suppressor at the beginning to take out visible enemies. Aim for headshots and try not to miss, as 80 percent accuracy is required.

To achieve Unmarked, silently kill most enemies outside. Use cover (press the cover button to crouch behind walls or objects) inside the house for the remainder of the mission. Start with enemies on the top balcony, then target those on the middle and bottom balconies. Be aware of enemies rolling barrels and shoot them as they emerge. For remaining enemies, use an accurate weapon like a pistol or Carbine Rifle and aim for headshots. Use Trevor’s special ability if struggling. Once outside enemies are dealt with, quickly enter the house, take cover against the back wall, and pick off remaining enemies. Keep an eye on the radar (your minimap with nearby blips and threats marked) (your minimap (the small circular map in the bottom-left corner of your screen) with nearby blips and threats marked) for hidden enemies.

For the 2 Birds, 1 Stone requirement, you can kill brothers standing in a line next to a red canister, those on the top balcony, or shoot the gas canister to trigger an explosion.

To meet the Accuracy requirement, ensure you do not miss shots and use a highly accurate weapon. If a shot seems difficult, close the distance slightly.