Objective: Kill 1 alien.
Objective: Recover a loose core.
Hey! That's mine!
Objective: Kill an alien carrying a power core.
Objective: Earn at least one silver medal.
Objective: Build 5 Gun towers.
Objective: Kill 100 aliens.
Objective: Win with 1,000 resources remaining.
Yellow Beats Green
Objective: Upgrade a tower.
Burn Baby Burn
Objective: Build 5 Inferno towers.
Objective: Destroy at least one boss alien.
Objective: Win with 5,000 resources remaining.
Objective: Build 5 Laser towers.
Objective: Save a core less than 10 seconds away from the map exit.
What IS that?
Objective: Inspect 10 aliens.
Objective: Build 20 towers in one mission.
Objective: Activate reconnaissance system.
Objective: Destroy 1000 aliens.
Not So Fast
Objective: Build 5 Temporal towers.
Objective: Shoot down a flying alien.
Objective: No towers sold in a single mission.
Objective: Finish the first 3 missions.
Objective: Use speed up controls for a total of 30 seconds in any one mission.
Objective: Earn at least one gold medal.
Great Ball of Fire
Objective: Build 5 Meteor towers.
Objective: Build 5 Cannon towers.
Objective: Sell 5 towers.
Objective: Win with 10,000 resources remaining.
Objective: Build 5 Tesla towers.
Death From Above
Objective: Fire the orbital laser.
The Not-So-Friendly Skies
Objective: Build 5 Missile towers.
Objective: Shoot down flying alien carrying a core.
Objective: Build 6 towers within 10 seconds.
Objective: Build 5 Concussion towers.
Objective: Reload an earlier save checkpoint.
Objective: Build 5 Command towers.
Objective: Kill 10,000 aliens.
Objective: Build 50 towers in one mission.
Objective: Complete the Story mode.
Objective: Sell 10 towers in a single mission.
Objective: Build every tower and upgrade.
Objective: Witness 1 core handed off 10 times within 20 seconds.
Objective: Beat an advanced mission with only level 3 towers and no selling.
The Long Road
Objective: Alien time until exit exceeds 5 minutes.
Objective: Build all tower types in one mission.
Objective: Survive 100 waves on the Grinder challenge mode.
Objective: Beat an advanced mission with only Gun towers.
Objective: Beat an advanced mission with zero cores captured.
Objective: Win mission with the last core less than 10 seconds away from the map exit.
Objective: Beat an advanced mission with only level 1 towers.
Objective: Kill 50,000 aliens.
Objective: Gain 10000 resources from interest in a single mission.
Objective: Beat an advanced mission with only Cannon towers.
Objective: Earn a silver medal on all missions in the Story mode.
Few and Proud
Objective: Volunteered to take part and completed the mission! You may now recruit another group.
Objective: Build all upgrades of all tower types in one mission.
Objective: Earn a gold medal on all missions in the Story mode.
Objective: Beat an advanced mission with only Inferno towers.
Objective: Earn a gold medal on the Campaign mode of Service Interruption and Height of Confusion.
Objective: Earn a gold medal on the Campaign mode of Kill Zone and Overflow.
Objective: Earn a gold medal on the Campaign mode of Urban Planning and Tactical Diversion.
Objective: Earn a gold medal on the Campaign mode of Risk Exposure and Roundabout.
Objective: Earn a gold medal on all the modes of Overflow.
Objective: Earn a gold medal on all Challenge modes.
Top of the Class
Objective: Earn a gold medal on all the modes of Tony's Training and C.H.A.S.