Question about "Impossible" Challenges
I was just wondering if I had to unlock the impossible challenges to beat them. What I mean is, what if I play online with a friend who has already unlocked the Impossible Vocals Challenge, and he selects it, and I sing while he plays a random instrument? Will I get the achievement that way? Or do I have to unlock it myself and be the one who actually selects it in online band mode? Any helpful insight on this will be appreciated.
Thanks in advance!