This next achievement tutorial can be completed with the help of a friend. In the game Call of Duty: World at War, you find yourself back in time during World War II.
Unlike Modern Warfare 2, the weapons aren't as sophisticated but still get the job done. In this tutorial you'll see how you can get the Ruthless achievement in the game. To get it, you must kill 15 enemies while mounted on a tank in Ring of Steel. It's pretty easy to get, just aim and shoot. So good luck and enjoy!