This achievement requires you to complete the following 3 side quests:
1) The Warlock's Red Gaze
2) Wicked Watchers in the South
3) Crimson Eyes in the North
You can start these missions by talking to a woman in a red hood in the Fargarthian base, once you have progressed far enough in the story to meet their faction.
The quests will have you searching for and destroying FizzCo control modules or "crimson eyes".