Unlockable - Steam Achievements
A Bit of a Challenge - Complete all challenge chapters
All on Offense - Completed story chapter 8 on normal difficulty or harder without building a repair station
Arcadeologist - Reach wave 25 in Arcade mode
Battle Hardened - Complete all story chapters on Hard difficulty
Battle Hardened Hero - Get hero medals from all story chapters on Hard difficulty
Bring Them! - Reach wave 3 in Arcade mode
Elite Defender - Achieve a total score of 10 000 000 or more
First Victory - Complete the first level.
Gorg Buff - Check the credits
Hard Measures - Complete all challenge chapters on Hard difficulty
Little Extra - Finish a level on normal difficulty with 3 x the amount of money needed for the investor medal
Looks & Brains - Meet Sereia.
Master of the Universe - Reach wave 50 in Arcade mode
Mind the Black Hole - Deploy the Black Hole for the first time.
More Merciless than Ming - Complete all challenge chapters on Unstoppable difficulty
Mothership Smasher - Defeat a mothership.
No More Gorg - Complete the last level.
One Satellite Man - Complete a level using only one satellite type.
Radiant, Sir! - Meet the Radiant Beem.
Skeet Shooting - Defeat 1000 aliens.
Soon to be Hero - Achieve hero medals from 5 different story chapters
Space Age Hero - Get all the performance medals in one level in a single try.
Spare No Expense - Spend more than $15,000 in one level.
Stardust - Shoot 10 asteroids
The Researcher - Get 8 upgrade tokens.
Too Easy! - Achieve hero medal in story chapter 3 on normal difficulty or harder without building a single Blast Cannon
Unstoppable - Complete all story chapters on Unstoppable difficulty
Unstoppable Hero - Get hero medals from all story chapters on Unstoppable difficulty
Unstoppable Victory - Complete any level on unstoppable difficulty.