Guitar Hero 5

Keep a 4x multiplier the whole song or at least most of it, and use your star power when you can so you get an 8x.

Easy way to do this is to go on vocals and you can play a song with all talkies like Gratitude or Bring the noise 20XX. Then when you get star power use it to get 8x. You can put the mic up to a fan too and make it even more easy.

I would do Song 2 by Blur to get this achievement. The guitar is really easy and short. Play on easy and hit almost every note. Use Star Power in the parts with the fastest strum pattern. At the end you should have averaged a 4X and your achievement will pop.

Play a song in the first or second bracket on whatever diffuculty and instrument you want, you need to get about 2/3 of the song in one streak and get a couple star power phrases. If you really cant get this and have a mic, put the game on beginner and put a mic up to a fan or speaker, use your star power once and it should put you around the 4x just to be safe, you might want to use star power, this should get you the achievements: iron lung, over 9000, the one for streaking through the entire song, and obviously this one