In any of the shooting galleries, you will have one or two opportunities to get a random power up (power up are pretty obvious and are attached to a floating balloon across the screen). The Spread Shot power up (which looks like the achievement icon) lets you shoot in multiple/spread shoots in one shoot. Even tho you get a few extra shoots added, still makes the hit rate feel the same as one shoot. Unless you have targets side by side (almost touching each other), other than that you might only hit one target. Once you have control of the power up, be sure to hit as many targets as quickly as possible. The power ups last around 10 seconds or so, there is not noise or timer or counter, letting you know when your power up will end and how many targets you've hit. Some levels are easier to get this in than others. Playing any level in Space Frontier or Balloon Garden will give you a good chance. Hold down to rapid-fire.