Defense Grid - The Awakening - Platform: XBox 360

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.