Kill an enemy
Call all early waves in a stage
Call 10 early waves in a stage
Build 30 towers
Build 100 towers
Kill 2500 enemies
Kill 500 enemies
Build 200 towers
Kill 10000 enemies
Upgrade all guardians to level 3
Sell 5 towers in a stage
Sell 30 towers
Create 300 guardians
Kill an Elm golem
Get 50000 crystals
Kill an Angel golem
Kill a Satan golem
Upgrade all guardians up to max level
Kill a Diablo golem
Complete all forest stages with 3 stars
Complete all desert stages with 3 stars
Complete all lava stages with 3 stars
Complete all winter stages with 3 stars
Spend 60 hours playing the game
Finish all stages in Campaign mode
Finish all stages in Guardian mode
Spend some real money.
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