Saints Row

To take a hostage, make sure you have no Homies, and go up to a car with passengers. Go by the driver’s door, and hit Y to jack the car. Hit Y again to start Hijacking. You need to drive around until the timer runs out. If you stop or slow down, the passengers will escape, so go on the freeway. Each passenger of a car counts as 1 hostage toward the achievement. Hijacking SUVs with 3 passengers is the fastest way to raise your number of hostages taken.