To earn this achievement you must complete these 3 additional side quests all located at the Fargarthian Base, which is the 3rd faction you meet by playing through the main story.
1. The Warlock's Red Gaze
2. Wicked Watchers in the South
3. Crimson Eyes in the North
Simply speak to the woman in red to start each quest. The quests require you to destroy the Crimson Eyes (Fizzco Controllers). They can only be destroyed by using Melee attacks.