Use the 3 ADS systems to take out the Leviathan Remnant at the end of Chapter 8. Activate each console, aim at the weak point with
and fire with
. Once the weak point and ADS consoles are destroyed, move on to the next one. The Leviathan Remnant will add new attacks with each ADS. First, it will launch tentacles at you. Then, it will spit explosives. On the way to the last ADS, it will cover the area with proximity mines. The final ADS will likely be destroyed before killing the Remnant. Switch tactics and return the explosives back to the Leviathan Remnant. Once the third weak point is destroyed, the achievement will unlock.