Unlock level selection:
Finish the entire game on the Insane difficulty level.
Achievements:
Complete the following achievements to award the indicated amount of
Xbox Live Gamerscore points.
Untouchable (15 Gamerscore points):
Finish a level without taking damage.
Legend (50 Gamerscore points):
Finish the game on Insane difficulty level.
Immortal (15 Gamerscore points):
Finish a level without dying or losing any allies.
Hero (25 Gamerscore points):
Finish the game on Normal.
Halfway Point (5 Gamerscore points):
Finish Mission 3 on any difficulty level.
Exterminator (15 Gamerscore points):
Destroy all enemies in a level.
Epic Warrior (10 Gamerscore points):
Form a four-ship (Epic) formation.
Diplomat (15 Gamerscore points):
Finish a level without firing.
Teamwork (15 Gamerscore points):
Score 10,000 Gamerscore points while attached in a level.
Rookie (5 Gamerscore points):
Earn 30,000 Gamerscore points.
Veteran (10 Gamerscore points):
Earn 100,000 Gamerscore points.
Ace (20 Gamerscore points):
Earn 185,000 Gamerscore points.
