Here is the full list of all 51 Guitar Hero: Metallica trophies - there are 37 bronze, 12 silver, 1 gold and 1 platinum.
Earn all of the Bronze, Silver and Gold Trophies in Guitar Hero Metallica
Score 340,000 on the song Fight Fire with Fire as the bassist
Score 575,000 on the song Creeping Death as the guitarist
Score 450,000 on the song Dyer's Eve as the drummer
Score 330,000 on the song Enter Sandman on guitar
Complete a song on Expert + in Quickplay or Career (drums only)
100% a song (4 player band)
Win an online Band v Band match (8 players)
Complete a song with all band members on expert in Quickplay or Career (4 player band)
All band members trigger star power simultaneously (4 player band)
Score 1,000,000 on the song Battery as a band (4 players)
Earn a band Hot Streak (4 player band)
Win an online battle match with the Fade to Black power up
Score 65,000 on the song Stone Cold Crazy as the vocalist
Complete a song in a band in Quickplay or Career (4 players)
Earn the highest individual score on a song in a band (4 player band)
Drum every green note and finish the song Blood and Thunder with the rock meter in green
Complete all instrument careers
Complete the career as the drummer
Complete the Tutorials
Perform as the drummer
Complete the career as the vocalist
Perform as the vocalist
Complete the career in a band (2-4 player band)
Play 20 online matches
Complete the career as the bassist
Earn $15,000
Win an online Pro Face-Off match by 25,000 points or more
Win an online Pro Face-Off match
Win an online Face-Off match by 25,000 points or more
Win an online Face-Off match
View a Metallifacts video
Complete any instrument career on Expert (Guitar, Bass, Vocals, Drums or Band)
Complete a song in every venue
Rock out as King Diamond
Complete a song at The Stone venue
Hit every star phrase in the song Orion
Complete the career as the guitarist
Complete a song at the Ice Cave venue
Rock out as Lemmy
Perform as the bassist
Create a new custom band logo
Create a new custom tattoo
Download a song from GHTunes
Complete a song in every In-the-Round venue
Earn 100 stars in Band Career or any single instrument Career
Recover from a poor performance in Quickplay or Career
Create a new custom instrument (guitar, drums, mic)
Create a new custom rocker
Perform as the guitarist
Complete a song with any instrument on Hard or Expert in local Quickplay or Career