Here is the full list of all 23 Super Mega Space Blaster Special achievements.
Unlocked Gobuki (space blaster 2).
Unlocked Lunavi (space blaster 3).
Unlocked Mantis (space blaster 4).
Unlocked Weevil (space blaster 5).
Unlocked Cherub (space blaster 6).
Unlocked Mozi (space blaster 7).
Unlocked Hornet (space blaster 8).
Unlocked Diptera (space blaster 9).
Unlocked Moon-Wraith (space blaster 10).
Complete a challenge.
Complete 10 challenges.
Complete all the challenges.
Achieve a score of 15,000 in any mode with Nibula.
Achieve a score of 20,000 in any mode with Gobuki.
Achieve a score of 25,000 in any mode with Lunavi.
Achieve a score of 30,000 in any mode with Mantis.
Achieve a score of 35,000 in any mode with Weevil.
Achieve a score of 40,000 in any mode with Cherub.
Achieve a score of 15,000 in any mode with Mozi.
Achieve a score of 60,000 in any mode with Hornet.
Achieve a score of 75,000 in any mode with Diptera.
Achieve a score of 100,000 in any mode with Moon-Wraith.
Achieve all other achievements.