Here is the full list of all 10 Radiant Defense achievements.
Upgrade 5 weapons to the max in a single mission.
Finish 3 missions on 3 stars.
Save 1000 or more credits in a single mission.
Build all weapons in a single mission.
Place 50 weapons in a single mission.
Fire all superweapons in a single wave.
Finish 12 missions on 3 stars.
Collect 100 Dancing Aliens.
Finish 5 missions without the Research Unit.
Kill 30000 aliens.