Upgrade a Spud
Unlock a new turret combination
Win a fight against Zombuds
Conquer another player's planet
Win a fight without any Spud
Conquer a hard Zombud planet
Win a fight without using the turrets
Unlock all turret combinations
Unlock all Spuds
Upgrade a Spud to a maximum level
Reach 100 Spud population
Upgrade all Spuds to maximum level