Guitar Hero III
59 Achievements
1,000
Xbox 360
Streaker
Earn a 150 note streak in a Ranked Online Battle mode match
10
How to unlock the Streaker achievement in Guitar Hero III - Definitive Guide
All this achievement is luck and a little bit of skill. You will need to get into a ranked battle game where you know the song relatively well. You will also need to pray that your opponent doesn't hit you with some bad power-ups and lets you finish the notes off. Just play and it should come. Try hosting and picking a song you're good at.