Upgrade Cannon to Level 6
Upgrade Corruption to Level 6
Upgrade Crystal to Level 6
Upgrade Flamethrower to Level 6
Upgrade Kaboom to Level 6
Upgrade Crossbow to Level 6
Upgrade Totem to Level 6
Freeze the same enemy 2 times with the Freeze power
Burn an enemy via the Explosion power
Unlock "See Through Tower" upgrade
Stun an enemy with the Zap power
Build all types of weapons (Standard weapons only)
Kill 10 Spiders enemy with Flamethrower weapon
Complete a wave only with Crystal weapons
Kill a Hen with Kaboom
Kill 10 Flyers with weapons
Hit a Boss enemy with all powers
Kill a Coin Mimic or Anvil Mimic
Kill a Stunner with the Zap power
Kill 10 enemies with the Explosion power
Hit Scared Rush with Freeze 3 times
Kill Regenerator with a Corruption weapon
Complete Underground Tier
Complete Earth Tier
Complete Heaven Tier