Here is the full list of all 13 Slamoids! achievements.
Destroy 20 Gold Slamoids Lifetime
Destroy 800 Large Slamoids Lifetime
Destroy 700 Medium Slamoids Lifetime
Destroy 600 Small Slamoids Lifetime
Fire 10,000 Shots Lifetime
Have a No-Hit Streak of 3 Minutes or Longer
Destroy 3,000 or More Slamoids Lifetime
Destroy 100 Large Slamoids in a Single Round
Destroy 80 Medium Slamoids in a Single Round
Destroy 50 Small Slamoids in a Single Round
Destroy 1,000 or More Slamoids Lifetime
Get a 1,500 (or better) Hi-Score
End a Round by Getting Hit by a Gold Slamoid