Here is the full list of all 10 Holodance achievements.
Used all possible ways to interact with the music in the level selection scene. Still the "old style"!
Has found out all easter eggs in the tutorial in the first level. Currently cannot be achieved because of a bug!
Played one Session in any Level without missing a single note.
Played one Session in any Level/Track, only using your head and still achieving the minimum score to complete that level.
Played one Session in any Level/Track, only using your left hand and still achieving the minimum score to complete that level.
Played one Session in any Level/Track, only using your right hand and still achieving the minimum score to complete that level.
Has completed any level while Timing Lasers, Target Grid and Impact Points were disabled for at least three minutes.
This is the advanced version of "I use My Head". The first time I saw Ruu (Ruirize on Twitch), he played an osu! beatmap, with Sliders and Spinners, using only his head. So he truly earned to have his own achievement. The way to get it: Play a decently difficult osu! beatmap only with your head, and catch "enough" notes.
NEW (2017-07-15): If you have Vive Trackers, you can now play Holodance also with your feet. "Fully Tracked" is the achievement you will unlock by playing one song with orbs for your feet (and actually catching some).
Paying attention in Desert Clouds and Icy Clouds you have metaphorically removed the yearly traffic of 12 airplanes, significantly reducing CO2-emissions as a small step to slow down human-caused climate change! Also, you understand that while blowing things up in VR is so much fun, true warriors improve the world without using violence. To you, shooting airplanes in Holodance simply means choosing not to fly.