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If you are losing cores and have to resort to using the laser, than you suck at the game.

I did it by filling the center half-circle with maxed out gun towers and 1 command tower in the center of them, placed 1 Inferno + temporal near the entrance, and 1 missile tower at the far right.

When you first gain the use of the orbital laser it tells you in the black tip box that appears, that you do not get resources for enemies killed by the laser. It is a major trade off, especially if...

On another board someone posted that it only counts gold medals received in "The Awakening", not in the extra campaign. I got it around map 8-9 by doing all the challenges on each map up to that...