Defeat Forest biome boss

Start any level

Defeat Wasteland biome boss

Defeat Swamp biome boss

Defeat final boss

Defeat Mountain biome boss

Complete all Planet X levels

Save the natives

Destroy 100 robots with snipers

Fire 256 sniper rounds

Field some space marines

Field 64 marines

Use 1337 hand grenades or mortar rounds

Field 256 marines

Fire 500 missiles from orbit

Deploy 32 reinforcements

Build 50 towers

Deploy 128 reinforcements

Build 200 towers

Build 400 towers

Gain 10 stars

Build 800 towers

Gain 20 stars

Gain 30 stars

Gain 50 stars

Gain 40 stars

Gain 75 stars

Gain 90 stars

Destroy 50 robots in melee

Gain all 111 stars

Destroy 100 robots in melee

Destroy a robot with native arrows

Destroy 99 robots with satellites

Destroy 128 robots with fire

Destroy 128 robots with Atomizer

Instakill 50 robots

Stun 384 robots