Here is the full list of all 9 Auditorium HD trophies - there are 6 bronze, 1 silver and 2 gold.
Complete the Classic track list
Beat a black hole level without ever losing a particle to a black hole
Bounce a particle off the Deflect control 4 times
Complete the Modern track list
Have a single particle change its color 3 times
Have a particle go through a portal twice
Complete half of either track list
Win by manually spraying particles into a container
Beat the first act of any track list