Here is the full list of all 17 Dance Magic achievements.
Collect 300 secret notes.
Earn rating S or higher at 20 music tracks on Hard difficulty in Freestyle.
Earn rating M at any music track on Hard difficulty in Freestyle.
Buy for game currency everything that is sold.
Gain 999 999 money.
Complete the Tournament for all characters.
Defeat an opponent in Freestyle online-multiplayer on Hard difficulty.
Defeat an online opponent in Dance battle on the track with BPM above 180.
Perform 100 Specials.
Fill your Combo to level 10 and deal damage using Rage.
Defeat an AI opponent on maximum difficulty using custom music.
Collect all arrows on Hard difficulty using ingame songs.
Collect 30 secret notes.
Complete one Tournament.
Stun your opponent and defeat him until the stun is over.
Pass any track for the first time on any difficulty.
Win for the first time in Dance battle.