Fire In The Hole is an achievement/trophy in Metro 2033 and Metro 2033 Redux, awarded to the player after killing 20 lurkers. Lurkers are fairly susceptible to gunfire and can be downed quickly with most weapons, but due to their agility the use of automatic weaponry is unadvised as it will cause the player to fire more shots than necessary in an attempt to kill fleeing lurkers. Shotguns are the best choice as the spread of the shots can easily kill a rapidly advancing pack of lurkers. The revolver is good at picking off any stragglers as one shot is usually all you need to kill one. If you have the Ranger Pack DLC, the Volt Driver is also a good weapon as one shot to any location will instantly kill a lurker and the alternate attack is effective for when they are up close. The levels where this achievement is easiest to achieve are Defense and Child.