Unlockables Steam achievements:

Achievement         Description
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Abstinence        - Complete a regular stage without collecting a single
                    Power-Up.
Battleship        - Destroy five asteroids at once.
Destroyer         - Destroy seven asteroids at once.
Field Medicine    - Get two extra-lives with a single score upload.
Hard to kill      - Score exceeds 1,000,000 points (Survival).
High Score Hunter - Score exceeds 3,000,000 points (Campaign).
Hyperspeed        - Finished a stage in less than 90 seconds.
Immortal          - Score exceeds 10,000,000 points (Survival).
Jackpot           - Score exceeds 1,500,000 points (Campaign).
Payoff            - Score exceeds 500,000 points (Campaign).
Rock n' Roll      - Destroy 50 big asteroids in a single game.
Survivor          - Survive 3 stages in a row without losing a life.
The will to live  - Score exceeds 2,500,000 points (Survival).
Triumph           - Completed the single player campaign.
True Skill        - Score exceeds 5,000,000 points (Campaign).
Unstoppable       - Score exceeds 5,000,000 points (Survival).
Untouchable       - Complete a whole sector without dying once.