Win the first stage with 3 stars.

Slay 500 enemies.

Call 15 waves early.

Destroy 80 Chompbots.

Build 80 Towers.

Kill 13 Engineers before they can repair a machine.

Slay 3,000 enemies.

Defeat Bolgur, Lord of the Dwarves.

Remove the ice from 25 frozen towers.

Defeat Jokull, the Mother of Wyverns.

Slay 10,000 enemies.

Defeat Denas, King of Linirea.

Get 3 Stars on every stage of the Dwarven Kingdom.

Spawn 1,500 Reinforcements.

Melt the T-800.

Destroy 3 mine carts before they reach their destination.

Find Scrooge McDuck.

Deal a total of 5,000 damage with the basic attack of the Orc Shaman.

Slay 300 Draugrs.

Make the horn whisper a song.

Get 3 stars on every stage of the Kingdom of Linirea

Kill Leeroy Jenkins' brother.

Summon 13 Gargoyles.

Get 3 stars in every stage of the Frozen North

Help DK through the mines.

Defeat Polyx the Wise.

Sell 20 towers.

Defeat the Water Dragon King.

Defeat the Winter Queen of the Frozen North.

Help Baldo sneak into the mountain.

Put Borney to sleep.

Find Olav the magical iceman.

Help the yeti have a decent meal.

Get rid of those annoying pests and whack 5 Moles.

Find out why the dog is barking.

Defeat the ferocious Great-T.

Fend off the Draugrs.

Hire 5 Trolls.

Find the Hypnotoad and obey.

Find the secret agents.

Sink the girl in the Black Lagoon.

Collect the five pieces of Lord Blackburn's armor.

Take the ring back from Bollum before it's too late.

Force the undermined to breathe some fresh air.

Make Kermit take a sip of tea.

Resurrect Bonehart... again.

Reach level 10 with Asra.

Make the frog cross the road.

Spawn 500 Skeleton Warriors to battle.

Become the White Lotus priest apprentice.

Destroy the farmer's crops.

Turn off all the streetlamps.

Make Elite Harassers dodge 800 attacks.

Shoot all the fireworks.

Find all the armadillos.

Poke the demogorgons out of their hiding.

Great Scott! Burn 88 Presto logs and reach maximum speed!

Spawn 200 Spiderlings.

Find the First Avenger.

Reach level 10 with Oloch.

Reach level 10 with Veruk.

Find the Gommi Bears.

Find Slenderman, the old-fashioned horror creature.

Complete the Campaign in Veteran difficulty.

Find the hidden Root.

Win all the Heroic mode campaign challenges

Win all the Iron mode campaign challenges

Hire 50 mercenaries

Make your crows deal 30,000 total damage.

Find the hidden cute dino who likes bushes.

Launch 500 nitro-boosted rockets.

Execute 81 enemies with the chainsaw sword.

Summon 50 Orc Captains.

Complete the Campaign in Impossible difficulty.

Kill 200 enemies with beehives.

Teleport 666 enemies with the Infernal Mages.

Kill 5,000 enemies with Vez'nan's powers.