Here is the full list of all 31 Floor Kids achievements.
Perform all 4 of any characters combos in one dance routine
Perform a strobe while hitting a combo
Perform 50 Hops in one dance routine
Do 100 holds and poses in one dance routine
Unlock all of Hiyo Ono's move cards
Recruit a full crew
Unlock all of Bizzy's move cards
Unlock all of O-Live's move cards
Unlock all of Ruckus's move cards
Perform a hop, reversal and pose in one dance routine
Unlock all of Raquette's move cards
Unlock all of Noogie's move cards
Earn 5 crowns on all tracks on The Studio
Ace the rhythm section and fast tap in both choruses
Unlock all of Scribbles' move cards
Earn 5 crowns on all tracks on The Corner
Unlock all of Saboya's move cards
Earn 5 crowns in a dance routine.
Hit all crowd requests in a dance routine
Unlock all achievements
Earn 5 crowns on all tracks on The Metro.
Earn 5 crowns on all tracks on The Grocery.
Earn 5 crowns on all tracks on The Art Space.
Earn 5 crowns on all tracks on The Arcade.
Earn 5 crowns on all tracks on The Venue.
Earn 5 crowns on all tracks on The Peace Summit.
Make it to the rooftop (Earn 5 crowns on all Peace Summit tracks and unlock the epilogue)
Hit a 10 on Flavor (Perform all 16 moves plus fly moves on any character in one dance routine)
Get a 100% perfect rhythm score in one dance routine
Perform a strobe for 4 bars without falling
Earn over 100,000 points on a dance routine.