To get this achievement, start a
BIG TEAM BATTLE game and find a
RAZORBACK. It's a kind of Wartog but without a turret.
Get in the car and have 3 other players on board (1 passenger side and 2 at the back)
to unlock the achievement.
Please note:- you must be the driver of the vehicle,
- you all have to get on board in a short time.