Play Mission 13: Genesis on the Heroic difficulty. As soon as the Scorpion tank spawns near the beginning of the mission, get inside it. Proceed forward and shoot one of the enemy Ghosts. Once one of the enemy Ghosts is destroyed, exit the tank and either shoot the Elite in the other Ghost or have your teammates shoot at the second enemy Ghost while you sneak up on it and hijack it. Then, drive the Ghost over to the other two nearby Ghosts. Order your teammates to get inside the three ghosts, then get inside the Scorpion tank to get the "Rolling Thunder" achievement. Note: If both Ghosts get destroyed, simply reload the last checkpoint and try again.