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This Is Done On The Third Map

Build A "Siege Breaker" And Push Up To A Portal To Start Damaging It.

Be Careful! Upon First Approach, Most Greed Portals Seem To Spawn Slug Beasts To Halt Your Advance.

Slug Beasts
- You Can Backpedal Your Siege Breaker Away From Them
- Keep Them In Range Of Your Backpedaling Archers!
- Killing Them, Then Pushing The Siegebreaker Back Up To The Portal Seems To Not Spawn Another For A While. (Spawns Might Be Based On Total Portal Health, Not Sure Yet ;D)

Destroying A Portal On The Third Level Nets You This Achievement.


Good Luck!