Unlockables
Ace (20): Earn 185,000 points.
Diplomat (15): Complete a level without firing.
Epic Warrior (10): Form a four-ship (epic) formation.
Exterminator (15): Destroy all enemies in a level.
Halfway Point (5): Finish Mission 3 on any difficulty.
Hero (25): Complete the game on Normal.
Immortal (15): Complete a level without dying or losing allies.
Legend (50): Complete the game on Insane.
Rookie (5): Earn 30,000 points.
Teamwork (15): Score 10,000 points while attached in a level.
Untouchable (15): Complete a level without taking damage.
Veteran (10): Earn 100,000 points.
(Thanks to Bard)

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