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