In Chapter XI (11) you will get to a point that you will plant a jet pack bomb on a Decepticons face. Pretty funny. After the explosion, kill the few Decepticons in front of you. At this point is where you will start to hack a series of 5 security terminals. Describing this achievement will take some great details. So take a look at the video below:
NOTE: Possible glitch. If you manage to get caught or killed while hacking one of the terminals, you can restart from check point and all progress with carry over.
Here is a great video by NeedToAchieve showing you all 5 security terminal locations.