Here is the full list of all 9 Astervoid 2000 achievements.
That was easy, keep going!
Kill 100 bots in one round of Survival
Get a kill by blowing up an explosive asteroid
Destroy a ship while in critical mode
Hit another ship by bouncing a shot off a reflective asteroid
Destroy two ships using a melee attack
Destroy three ships using a melee attack
Destroy two ships using the explosion from the warship
Destroy three ships using the explosion from the warship