After loads of failed attempts, I found an easy way to get this. start the game in architect mode, using the lazy mode mod. Then put 1 little machine gun either side of the starting shield, then upgrade each one once. Now just keep sliding your finger back and forth across the screen. that way the screen will be full of blue bullets, because they bounce when they hit the top of the screen. now just keep playing untill you get 1200 points. Once you have 1,200 you need to buy all 4 lasers before you start a new round. Then as soon as the round starts, fire the lasers and that’s it. DONE.
*note* the achievement doesn’t unlock untill the end of the game.