Start a wave early.
Hit the gong.
Let no enemy pass through the doors of the Old Halls.
Scare at least 50 enemies per mission.
Complete the "Beach" mission.
Early-start 10 waves.
Build 50 towers.
Early-start 100 waves.
Build 100 towers.
Complete the Challenge for the "Beach" mission.
Complete the "Buried Trail" mission.
Complete the "Beach" mission in Inferno mode.
Complete the Challenge for the "Buried Trail" mission.
Complete the "Buried Trail" mission in Inferno mode.
Complete the Challenge for the "Golden Temple" mission.
Complete the "Golden Temple" mission.
Complete the "Golden Temple" mission in Inferno mode.
Kill 1000 enemies.
Kill 10000 enemies.
Kill 1000000 enemies.
Kill 100000 enemies.
Complete all the "Highlands" missions.
Complete all the "Desert" missions.
Complete all the missions and get at least one star per mission.
Complete all the "Frostlands" missions.
Complete all the missions and get at least two stars per mission.
Complete all the missions and get at least three stars per mission.
Earn at least 10000 gold coins.
Earn at least 1000 gold coins.
Earn at least 100000 gold coins.
Earn at least 1000000 gold coins.
Give any specialized tower a maximum upgrade.
Upgrade any tower to third grade.
Kill an enemy with lightning.
Kill 1000 enemies with lightning.
Summon MacHellman.
Teleport 200 enemies.
Summon MacHellman 100 times.
Build every type of tower.
Sell 50 towers.
Sell a tower.
Complete the "River Pass" mission.
Complete the "Darkwood" mission.
Complete the "Wastelands" mission.
Complete the "Rockway" mission.
Complete the "Paladins' Crossroad" mission.
Complete the "Oasis" mission.
Complete the "Snowbound Bastion" mission.
Complete the "Frozen Beach" mission.
Complete the "Old Castle" mission.
Complete the "Burning Pass" mission.
Complete a mission without using any abilities.
Complete a mission without building a single tower.
Strike water with lightning.
Use lightning to cause damage to 5 enemies in a river.
Use both of the altar's abilities in a single mission.
Burst a toxic bubble.
Cause damage to 100 enemies with the river of fire in a single mission.
Let no enemy leave the tunnel.
Freeze the river.
Convince 50 enemies to fight on your side with a treasure chest in a single mission.
Remove snow to find a tower placeholder.
Point and shoot from a catapult.
Read all the tips.
Provoke Armageddon.
MacHellman must fight the battle for 600 seconds in total.
Kill 1000 flying enemies.
Defeat Paladin.
MacHellman must defeat an Old Mage.
Defeat Breaker.
Complete the Challenge for the "River Pass" mission.
Complete the Challenge for the "Rockway" mission.
Complete the Challenge for the "Darkwood" mission.
Complete the Challenge for the "Wastelands" mission.
Complete the Challenge for the "Paladins' Crossroad" mission.
Complete the Challenge for the "Frozen Beach" mission.
Complete the Challenge for the "Oasis" mission.
Complete the Challenge for the "Snowbound Bastion" mission.
Complete the Challenge for the "Old Castle" mission.
Complete the "Forsaken Palace" mission.
Complete the Challenge for the "Burning Pass" mission.
Complete the Challenge for the "Forsaken Palace" mission.
Complete the "Heart of Fire" mission.
The Fallen Paladin must fight the battle for 300 seconds in a single mission.
Complete the Challenge for the "Heart of Fire" mission.
Unleash the power of the Heart of Fire.
Complete the "River Pass" mission in Inferno mode.
Complete the "Rockway" mission in Inferno mode.
Complete the "Darkwood" mission in Inferno mode.
Complete the "Wastelands" mission in Inferno mode.
Complete the "Paladins' Crossroad" mission in Inferno mode.
Complete the "Frozen Beach" mission in Inferno mode.
Complete the "Oasis" mission in Inferno mode.
Complete the "Snowbound Bastion" mission in Inferno mode.
Complete the "Old Castle" mission in Inferno mode.
Complete the "Forsaken Palace" mission in Inferno mode.
Complete the "Burning Pass" mission in Inferno mode.
Complete the "Heart of Fire" mission in Inferno mode.