CheatCodes.com has the complete list of all Ion Assault Achievements and Gamerscores for Xbox 360, including all secret Achievements. All official Xbox 360 achievements for Ion Assault as of Saturday May 25, 2013 are shown below, or you can print out our Printable Achievements Checklist that shows all Ion Assault Achievements and Gamerscores in a simple quick-reference format.
Complete the single player campaign.
Complete the cooperative campaign.
Destroy five asteroids at once.
Destroy seven asteroids at once.
Complete a stage without collecting a Power-Up.
Complete a whole sector without dying once.
Finish a stage in less than 90 seconds.
Score more than 500,000 points in a single game.
Score 1,500,000 points in a single game.
Survive 3 stages without dying once.
Destroy 50 big obstacles in a single game.
Continue playing to unlock this secret achievement.