Accumulate 1,000,000 points
(Offline - Solo, Multiplayer or Co-Op)
At the end of each song you are given a star rating out of 5 and an overall score so in general, a 5 star performance will be in the region of 90,000-100,000 points so in theory you could get this in just over 10 songs, if done well. Either way this trophy will pop once you have accumulated 1,000,000 points in the game. This is one counting trophy that I didn't have any issues with.