Full list of all 16 geoDefense achievements worth 200 gamerscore. It takes around 2-3 hours to unlock all of the achievements on Windows Phone.
Beat any of the easy levels
Win each of the easy levels
Beat every easy level without losing a life on any.
Win any of the medium levels
Beat 10 Medium levels
Beat 10 Medium level without losing a single life!
Beat any hard level
Beat 10 Hard levels
Beat 10 Hard levels without losing a single life!
Upgrade a Blaster Tower to level 7
Upgrade a Laser Tower to Level 7
Upgrade a Missile Tower to Level 7
Upgrade a Shock Tower to Level 7
Upgrade a Vortex Tower to Level 7
Score a x50 Multiplier Bonus from any Creep
Place one of each Turret on a level that supports all five Turrets