For the scrape lasers for 30 seconds achievement: Play on Level 2 and turn off wingmen. When you see a big horizontal enemy come down the screen half way then it stops, don't kill it. It will start shooting laser beams straight out all over the screen like a star, then it starts to rotate. You have to stay close to the lasers (scrape them). There's lots of these enemies on Level 2 and you will get the achievement.
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