Defense Grid - The Awakening XBox 360 Game cheats,secrets,codes and keys

Defense Grid - The Awakening

Achievements:
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Accomplish the indicated achievement to get the corresponding number of
Gamerscore points:

  Salvage Rights (5 points): Destroy at least one boss alien.
  Field Promotion (10 points): Earn at least one silver medal in any mission
  after The Awakening.
  Death From Above (10 points): Fire the orbital laser.
  Tower Expert (10 points): Build at least one of every tower type and available
  upgrade.
  Flawless Victory (15 points): Earn at least one gold medal in any mission
  after The Awakening.
  Nail Biter (15 points): Win a mission with the last remaining core less than
  10 seconds away from the map exit.
  Base Defender (20 points): Complete the Story mode in The Awakening campaign.
  Planet Defender (20 points): Earn at least a silver medal on all Story mode
  missions in The Awakening campaign.
  Exterminator (20 points): Destroy 1000 aliens.
  Alien Tears (20 points): Earn at least a gold medal on all Story mode missions
  in The Awakening campaign.
  Siege Breaker (25 points): Survive all 99 waves on any Grinder challenge mode.