Complete each condition to get the allotted achievements.

Achievement	How to unlock
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.
The Not-So-Friendly Skies	Build 5 Missile towers.
Tower Expert	Build every tower and upgrade.
Untouchable	Beat an advanced mission with zero cores captured.
Well Invested	Gain 10000 resources from interest in a single mission.
What IS that?	Inspect 10 aliens.
Xenocide	Kill 50,000 aliens.
Yellow	Beats Green Upgrade a tower.