How to Get the Quick Draw achievement in Metro 2033

If you're looking to shoot a hideous looking creature that has no where to run, this achievement tutorial is just what you need! In the post-apocalyptic video game, Metro 2033, you can get a sweet 30 gamer points by making sure you shoot a bunch of creatures known as Nosalises, before they break the vents into a room. It may seem easy but you have to be quick with your gun, hence the title Quick Draw. Good luck and enjoy!