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Alien Tears - Earn a gold medal on all missions in the Story mode.
Annihilator - Kill 10,000 aliens.
Arsenal - Build 20 towers in one mission.
Base Defender - Complete the Story mode.
Boot Camp - Finish the first 3 missions.
Burn Baby Burn - Build 5 Inferno towers.
Close Call - Save a core less than 10 seconds away from the map exit.
Confident - Use speed up controls for a total of 30 seconds in any one
mission.
Death From Above - Fire the orbital laser.
Diversity - Build all tower types in one mission.
Eradicator - Kill 100 aliens.
Exterminator - Destroy 1000 aliens.
Field Promotion - Earn at least one silver medal.
Filthy Rich - Win with 10,000 resources remaining.
Firebug - Beat an advanced mission with only Inferno towers.
First Blood - Kill 1 alien.
Flawless Victory - Earn at least one gold medal.
Full Defense - Build 50 towers in one mission.
Full House - Build all upgrades of all tower types in one mission.
Full Potential - Beat an advanced mission with only level 3 towers and no
selling.
Great Ball of Fire - Build 5 Meteor towers.
Gun Crazy - Beat an advanced mission with only Gun towers.
Happy Returns - Recover a loose core.
Head Trauma - Build 5 Concussion towers.
Hey! That's mine! - Kill an alien carrying a power core.
High Voltage - Build 5 Tesla towers.
I Spy - Activate reconnaissance system.
Indecisive - Sell 10 towers in a single mission.
Kaboom! - Build 5 Cannon towers.
Leadhead - Build 5 Gun towers.
Liquidator - Sell 5 towers.
Master Strategist - Earn a gold medal on all Challenge modes.
Minimalist - Beat an advanced mission with only level 1 towers.
Nail Biter - Win mission with the last core less than 10 seconds away
from the map exit.
No Sale - No towers sold in a single mission.
Not So Fast - Build 5 Temporal towers.
Overseer - Build 5 Command towers.
Penny Pincher - Win with 5,000 resources remaining.
Pew Pew - Build 5 Laser towers.
Planet Defender - Earn a silver medal on all missions in the Story mode.
Power Builder - Build 6 towers within 10 seconds.
Pyrrhic Victory - Shoot down flying alien carrying a core.
Relay Race - Witness 1 core handed off 10 times within 20 seconds.
Retry - Reload an earlier save checkpoint.
Salvage Rights - Destroy at least one boss alien.
Sharpshooter - Shoot down a flying alien.
Shell-shocked - Beat an advanced mission with only Cannon towers.
Siege Breaker - Survive 100 waves on the Grinder challenge mode.
Surplus - Win with 1,000 resources remaining.
The Long Road - Alien time until exit exceeds 5 minutes.
Tower Expert - Build every tower and upgrade.
Well Invested - Gain 10000 resources from interest in a single mission.
Xenocide - Kill 50,000 aliens.
Annihilator - Kill 10,000 aliens.
Arsenal - Build 20 towers in one mission.
Base Defender - Complete the Story mode.
Boot Camp - Finish the first 3 missions.
Burn Baby Burn - Build 5 Inferno towers.
Close Call - Save a core less than 10 seconds away from the map exit.
Confident - Use speed up controls for a total of 30 seconds in any one
mission.
Death From Above - Fire the orbital laser.
Diversity - Build all tower types in one mission.
Eradicator - Kill 100 aliens.
Exterminator - Destroy 1000 aliens.
Field Promotion - Earn at least one silver medal.
Filthy Rich - Win with 10,000 resources remaining.
Firebug - Beat an advanced mission with only Inferno towers.
First Blood - Kill 1 alien.
Flawless Victory - Earn at least one gold medal.
Full Defense - Build 50 towers in one mission.
Full House - Build all upgrades of all tower types in one mission.
Full Potential - Beat an advanced mission with only level 3 towers and no
selling.
Great Ball of Fire - Build 5 Meteor towers.
Gun Crazy - Beat an advanced mission with only Gun towers.
Happy Returns - Recover a loose core.
Head Trauma - Build 5 Concussion towers.
Hey! That's mine! - Kill an alien carrying a power core.
High Voltage - Build 5 Tesla towers.
I Spy - Activate reconnaissance system.
Indecisive - Sell 10 towers in a single mission.
Kaboom! - Build 5 Cannon towers.
Leadhead - Build 5 Gun towers.
Liquidator - Sell 5 towers.
Master Strategist - Earn a gold medal on all Challenge modes.
Minimalist - Beat an advanced mission with only level 1 towers.
Nail Biter - Win mission with the last core less than 10 seconds away
from the map exit.
No Sale - No towers sold in a single mission.
Not So Fast - Build 5 Temporal towers.
Overseer - Build 5 Command towers.
Penny Pincher - Win with 5,000 resources remaining.
Pew Pew - Build 5 Laser towers.
Planet Defender - Earn a silver medal on all missions in the Story mode.
Power Builder - Build 6 towers within 10 seconds.
Pyrrhic Victory - Shoot down flying alien carrying a core.
Relay Race - Witness 1 core handed off 10 times within 20 seconds.
Retry - Reload an earlier save checkpoint.
Salvage Rights - Destroy at least one boss alien.
Sharpshooter - Shoot down a flying alien.
Shell-shocked - Beat an advanced mission with only Cannon towers.
Siege Breaker - Survive 100 waves on the Grinder challenge mode.
Surplus - Win with 1,000 resources remaining.
The Long Road - Alien time until exit exceeds 5 minutes.
Tower Expert - Build every tower and upgrade.
Well Invested - Gain 10000 resources from interest in a single mission.
Xenocide - Kill 50,000 aliens.