Rock Band 2 achievements

Rock Band 2

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There are a maximum of 50 Rock Band 2 achievements worth 2,168 (1,000)

79,221 tracked gamers have this game, 2,000 have completed it (2.52%)

Achievement Details

Groove Assassin in Rock Band 2

Groove Assassin45 (20)

Beat the Impossible Bass Challenge

  • Unlocked by 15,833 tracked gamers (20% - TA Ratio = 2.23) 79,221  

Achievement Guide for Groove Assassin

135,670 (83,040)
Achievement won on 21 Sep 08
TA Score for this game: 1,963
Posted on 24 September 08 at 23:06
This solution has 19 positive votes and 1 negative vote. Please log in to vote.
You have to beat the Impossible Bass Challenge for this achievement. However, note how the achievement description never states what difficulty.

This, like all the other non-secret "beat xxx impossible challenge" achievements, do not require you to beat them on Expert. You can beat them on any of the four difficulties.

Also, you don't have to even be playing bass or have unlocked the challenge in order to beat it. I'll explain. I got this achievement by joining up with another band and we tackled the Impossible Bass Challenge together from the last song (Panic Attack by Dream Theater). I wasn't actually a part of the band's roster at this point. I was playing bass and we beat the song. I got the achievement and so did everyone else (guitar, vocals, and drums).
So, you can play this in multiplayer and play as something that isn't the bass and still get the achievement. If you have some friends that have gone through the challenges and have the Impossible ones unlocked, you can use their band in order to beat them without having to unlock them yourself.
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