Here is the full list of all 25 Voice Commander achievements worth 1,000 gamerscore.
Out of my way!
Clear Wave 10
Finish the tutorial
Clear Wave 20
Clear Wave 30
Clear Wave 40
Destroy 5 000 enemies
Destroy 25 000 enemies
Destroy 100 000 enemies
Defeat the Mothership
Build 100 Laser Turrets
Build 100 Rocket Turrets
Build 100 Shock Turrets
Build 500 Laser Turrets
Build 500 Shock Turrets
Build 500 Rocket Turrets
Avoid crashing at all costs
Use 40 abilities in a row while never having a full tank
Kill 60 enemies with a single Vox blast
Kill 60 enemies with a single nuke
Trap 50 enemies with a single gravity bomb
Kill 60 enemies with a single shockwave
Get to wave 10 without taking ship damage
Beat the mothership without letting Vox die
Beat the mothership without using a nuke