Way easier than Rock Band 1's online achievements. Just go online and play a Score Duel or Tug of War game and win. Score Duel is you and your opponent play a song and the person with the most points wins, so use your overdrive wisely. Tug of War you each play like a duet, alternating parts, there is a crowd meter and the person that is doing better will have the crowd meter on their side. Overdrive will help you get the crowd on your side. This can also be done in local play, so just set it up so your playing by yourself with another controller. This and the achievement below can be done in a Live player or ranked match.