Muetschens2,549,689 Locked 25 Nov 2013 25 Nov 2013
You can get this achievement during the 18th and last mission called "The Ghost Killer". As with every other misc. achievement in this game you can play the mission on the easiest difficulty setting and still get it!
About midway through the mission while making your way along the train you will be attacked by several attack helicopters from the right side. When you destroy the second one it will crash into the train.
Now you want to stay on the left side of the train.
Move along on the left side until you see two enemies with grappling hooks on the side of the train. Hesh will also mention that they are climbing up the side of the train. Shoot them both and you will get your achievement.
*Note: Video was taken on the 360. I can replace it with a video taken on the One but I don't want to put two copies of each achievement on my YT channel. If somebody would rather see an Xbox One video let me know and I'll happily provide one for you. Thanks for reading*