This is also one of those easy to do achievements. The goal is to fire an enemy into another enemy using the Magnet Gun. For those who have difficulty in using the magnet gun, you will be taught below:

1. First of all, this can also be earned in Infestation mode. If you don’t know how to use the Magnet Gun, all you have to do is simply press when the reticle is yellow to fire an anchor point. Then press again when the reticle is blue set the attractor and to pull the first target to the second target.

2. Simply anchor an alien and set the attractor on another alien, preferably one without obstacles in between to ensure they make contact. After performing the task as said, the achievement will pop out on the top-right part of your screen.

Here below is the video version of the guide: