Here is the full list of all 32 SingStar Digital (EU) trophies - there are 18 bronze, 8 silver, 5 gold and 1 platinum.
Collect every SingStar™ trophy
Perform with a friend 300 times
Perform 400 songs
Perform with a friend 90 times
Accumulate 10000 seconds of perfect pitch
Play on SingStar's original launch date
Play on Christmas Day
Complete 500 Golden Notes
Save 20 pieces of media
Perform 100 songs
Upload a piece of media
Sing in harmony with a friend during a duet song
Complete 5 performances of a duet song with another player
Perform a duet song on St. Valentine's Day
Perform with a friend 30 times
View 50 pieces of media
Rate 10 pieces of media
Perform vibrato for a total of 300 seconds
Earn the "SingStar" score ranking in 20 normal length performances
Get the highest ranking on every line in a Normal length performance
Accumulate 3000 seconds of perfect pitch
Play 5 random songs selected by the Shuffle button
Perform 40 songs
Gain the number 1 position in 10 different score charts
Earn the "SingStar" score ranking in 10 normal length performances
Complete 5 rap performances
Perform 15 songs in one game session
Get the lowest score rank on any song
Fill every Golden Note in a normal length performance
Accumulate 500 seconds of perfect pitch
Perform vibrato for the first time
Get the highest ranking on 10 lines in a row