Here is the full list of all 31 Everybody Dance 3 trophies - there are 16 bronze, 9 silver, 5 gold and 1 platinum.
Unlock all other trophies
Dance for 10 hours in total
Get 40 hi-scores
5 star 50 sections in dance class mode
5 star 20 sections in dance class
Complete a section of any routine in dance class mode
Burn a total of 1000 Cals in Dance Workout
Play 50 dances
Perform a dance partners routine on St. Valentine's Day
Get at least a 'cool singing' rating in 5 performances
Save 10 video highlights
Get a 5 star rating on 5 professional, normal length routines
Get a 5 star rating on any professional, normal length song
Get a 5 star rating on 5 intermediate, normal length routines
Perform a dance workout
Reach the Cal target in every song of a single workout
Create a dance partners routine
Get a 5 star rating on 5 dance partners, normal length routines (excludes Creator Routines)
Play your first dance partners routine
Accumulate 1,000,000 points
Create a solo dance routine
Play 20 party rounds in total
Play a song late at night
Play a 5 round party
Get a 0 star rating on a beginner, normal length song
Play your first dance battle
Upload a video or snapshot highlight to the community gallery
Get a 5 star rating on 5 beginner, normal length routines
Heart 20 different videos or snapshots in the community gallery
Achieve a 70 move streak in any routine (excludes Creator Routines)
Play your first solo dance