- The Debuff skulls are: Fog, Sickness, Rebel Sympathiser, Rebel Supporter and Rebel Leader.
- The easiest way is to play until you're right near the end of the level, then turn on the debuff skulls and finish the level from there.
- Another easy way to unlock the achievement is to play Repairs on Easy difficulty. Activate the Debuff skulls at the beginning of the mission.
- Send your Spartans and an Air Unit to the center area. Spend all your time and resources on Cyclops units and Turrets.
- Prioritize the Cyclops units. The more you have working on repairs, the faster the level will end.
- Another easy way is to play the first level on easy and work quickly. The low resistance and large time bonus helps.