Here is the full list of all 49 Band Hero trophies - there are 38 bronze, 8 silver, 2 gold and 1 platinum.
Earn all of the Bronze, Silver and Gold Trophies in Band Hero
Complete a song with 4 players without any members failing on expert in Career or Quickplay
Complete a song as 4 of the same instrument on any difficulty in Quickplay or Career
Complete 50 of the Career Challenges at Platinum or Diamond
Earn an 11x multiplier
Complete 25 online Pro Face-Off matches, win or lose
Earn 555 Stars in Career
Play an online Do or Die game
Collect all of the Secret Notes
Hint: **r* **u****
Hint: **ll*** ****l*
Hint: ***v** **y*
Hint: *o ***b*
Hint: H*****
Hint: *v***s***c*
Hint: **v** *o***
Hint: ***o*n 5
Hint: *h* *ll-**e***** **j****
Hint: *** *ol**** ****e*
Hint: *e*** *c******y
Hint: A** * A*
Earn 333 Stars in Career
Complete at least one challenge for every instrument at Gold level or better
Score over 10,000 points while in a single Star Power deployment in Career or Quickplay
Play through every Band Hero song once
Complete the gigs and unlock all of the celebrity characters
Complete Career on any difficulty with any instrument
Unlock every venue
Complete 75% of the gigs in Career
Earn Diamond level on a Career Challenge
Score over 1,000,000 points as a band in any single song in Career or Quickplay
Streak through an entire song without missing a note on medium or harder difficulty
Hint: **n** ***k***
Hint: *a* B****a*
Hint: *e***w***d
Complete 50% of the gigs in Career
100% a song as a vocalist
Earn 111 Stars in Career
Hint: **l* *ll**
Host an online Career game and play a song
Complete 25% of the gigs in Career
Earn Platinum level on a Career Challenge
Hint: **y O******
Hint: **l*** **ff
Hint: **i** *i***
Complete all of the tutorials
Create a GH™Studio song
Complete a Career gig on any difficulty
Successfully complete a Band Moment