Drill Hard:
You will complete this by simply playing through the mission.
You must do it to simply survive and you will hit 20 victims quite fast.
The Achievement doesn’t require you to complete the mission.
The snag is that the Protoss buildings are on hills.
Instead, use the Drill, which however has to know where to shoot.
Airborne units would be useful for pointing the Laser at the buildings, though I doubt you have any.
The structure is quite resistant and can survive many attacks.
Move once you’re sure your base is protected enough with Bunkers and Tanks.
Afterwards they can return onboard and you will be able to continue discovering the area.
Take out the buildings afterwards.
Queuing actions comes in handy here.
you could mark a series of targets for the Laser by holding down Shift.
While you’re destroying the enemy buildings, keep on checking the minimap for any incoming Archons or Colossuses.
The achievement is rewarded during the mission.
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