Here is the full list of all 22 Everyone Sing trophies - there are 8 bronze, 5 silver, 8 gold and 1 platinum.
Complete any song in Party mode. Any difficulty, any sub game mode
Complete at least a single section of a song in any difficulty in Rehearse mode
Complete a song to 50 percent in the Know Your Song game mode singing lead lyrics
Complete a chain of 10 flawless lines in any difficulty in any game mode
Complete 20 lines of lyrics consecutively without an X note in any difficulty in any game mode
Earn all trophies to unlock this platinum trophy.
Score over 40 percent accuracy on 10 easy difficulty songs in any game mode singing lead lyrics
Score over 70 percent accuracy on 10 easy difficulty songs in any game mode singing lead lyrics
Score over 50 percent accuracy on 10 medium difficulty songs in any game mode singing lead lyrics
Score over 80 percent accuracy on 10 medium difficulty songs in any game mode singing lead lyrics
Score over 60 percent accuracy on 10 expert difficulty songs in any game mode singing lead lyrics
Score over 90 percent accuracy on 10 expert difficulty songs in any game mode singing lead lyrics
Complete 15 songs in any difficulty in any game mode singing lead lyrics
Complete a song to 100 percent in any difficulty in any game mode singing lead lyrics
Complete any song with 3 thumbs up in group mode
Complete round 5 in Group mode
Complete Group mode
Complete one song in Karaoke mode singing lead lyrics
Reach 200 golden notes in any difficulty in any game mode
Complete any song with a lead and backing singer. Any difficulty, any game mode
Complete all songs with a lead and backing singer. Any difficulty, any game mode
Completed the first time a team wins the match overall in Party mode.