Level select:To unlock level select, complete the game on Insane difficulty. Achievements:ACHIEVEMENT – HOW TO UNLOCKAce (20 points) – Earn 185,000 points.Diplomat (15 points) – Beat a level without firing.Epic Warrior (10 points) – Form a four-ship formation.Exterminator (15 points) – Destroy all enemies in a level.Halfway Point (5 points) – Finish Mission 3 on any difficulty.Hero (25 points) – Beat the gameon Normal.Immortal (15 points) – Beat a level without dying or losing allies.Legend (50 points) – Beat the game on Insane.Rookie (5 points) – Earn 30,000 points.Teamwork (15 points) – Score 10,000 points while attached in a level.Untouchable (15 points) – Beat a level without taking damage.Veteran (10 points) – Earn 100,000 points.