Here is the full list of all 18 Ion Assault achievements.
Complete a whole sector without dying once.
Completed the single player campaign.
Destroy seven asteroids at once.
Score exceeds 500,000 points (Campaign).
Complete a regular stage without collecting a single Power-Up.
Survive 3 stages in a row without losing a life.
Score exceeds 500,000 points (Survival).
Destroy five asteroids at once.
Finished a stage in less than 90 seconds.
Destroy 50 big asteroids in a single game.
Score exceeds 1,500,000 points (Campaign).
Get two extra-lives with a single score upload.
Score exceeds 1,000,000 points (Survival).
Score exceeds 2,500,000 points (Survival).
Score exceeds 5,000,000 points (Survival).
Score exceeds 10,000,000 points (Survival).
Score exceeds 3,000,000 points (Campaign).
Score exceeds 5,000,000 points (Campaign).