0 Alien TearsEarn a gold medal on all missions in the Story mode.
0 AnnihilatorKill 10,000 aliens.
0 ArsenalBuild 20 towers in one mission.
0 Base DefenderComplete the Story mode.
0 Boot CampFinish the first 3 missions.
0 Burn Baby BurnBuild 5 Inferno towers.
0 Close CallSave a core less than 10 seconds away from the map exit.
0 ConfidentUse speed up controls for a total of 30 seconds in any one mission.
0 Death From AboveFire the orbital laser.
0 DiversityBuild all tower types in one mission.
0 EradicatorKill 100 aliens.
0 ExterminatorDestroy 1000 aliens.
0 Field PromotionEarn at least one silver medal.
0 Filthy RichWin with 10,000 resources remaining.
0 FirebugBeat an advanced mission with only Inferno towers.
0 First BloodKill 1 alien.
0 Flawless VictoryEarn at least one Gold medal.
0 Full DefenseBuild 50 towers in one mission.
0 Full HouseBuild all upgrades of ALL tower types in one mission.
0 Full PotentialBeat an advanced mission with only level 3 towers and no selling.
0 Great Ball Of FireBuild 5 Meteor towers.
0 Gun CrazyBeat an advanced mission with only Gun towers.
0 Happy ReturnsRecover a loose core.
0 Head TraumaBuild 5 Concussion towers.
0 Hey! That's mine!Kill an alien carrying a power core.
0 High VoltageBuild 5 Tesla towers.
0 I SpyActivate reconnaissance system.
0 IndecisiveSell 10 towers in a single mission.
0 Kaboom!Build 5 Cannon towers.
0 LeadheadBuild 5 Gun towers.
0 LiquidatorSell 5 towers.
0 Master StrategistEarn a Gold medal on ALL Challenge modes.
0 MinimalistBeat an advanced mission with only level 1 towers.
0 Nail BiterWin mission with the last core less than 10 seconds away from the map exit.
0 No SaleNo towers sold in a single mission.
0 Not So FastBuild 5 Temporal towers.
0 OverseerBuild 5 Command towers.
0 Penny PincherWin with 5,000 resources remaining.
0 Pew PewBuild 5 Laser towers.
0 Planet DefenderEarn a Silver medal on ALL missions in the Story mode.
0 Power BuilderBuild 6 towers within 10 seconds.
0 Pyrrhic VictoryShoot down flying alien carrying a core.
0 Relay RaceWitness 1 core handed off 10 times within 20 seconds.
0 RetryReload an earlier save checkpoint.
0 Salvage RightsDestroy at least one boss alien.
0 SharpshooterShoot down a flying alien.
0 Shell-ShockedBeat an advanced mission with only Cannon towers.
0 Siege BreakerSurvive 100 waves on the Grinder challenge mode.
0 SurplusWin with 1,000 resources remaining.
0 The Long RoadAlien time until exit exceeds 5 minutes.
0 The Not-So-Friendly SkiesBuild 5 Missile towers.
0 Tower ExpertBuild every tower and upgrade.
0 UntouchableBeat an advanced mission with zero cores captured.
0 Well InvestedGain 10,000 resources from interest in a single mission.
0 What IS That?Inspect 10 aliens.
0 XenocideKill 50,000 aliens.
0 Yellow Beats GreenUpgrade a tower.