Here is the full list of all 37 Airtone achievements.
Get your first item
Talk with NEON for the first time
Get an SS+ rating in 1 song in BASIC
Clear your first PERFECT
Clear your first FULL COMBO
Get an SS+ rating in 1 song in MEDIUM
Get an SS+ rating in 1 song in HARD
Get an SS+ rating in 5 songs in BASIC
Get an SS+ rating in 5 songs in MEDIUM
Get an SS+ rating in 5 songs in HARD
Get an SS+ rating in 10 songs in BASIC
Get an SS+ rating in 10 songs in MEDIUM
Get an SS+ rating in 10 songs in HARD
Get a B+ rating in 25 songs in BASIC
Get a B+ rating in 25 songs in MEDIUM
Get a B+ rating in 25 songs in HARD
Get a + rating in 25 songs across all levels
Get a FULL COMBO in 25 songs in BASIC
Get a FULL COMBO in 25 songs in MEDIUM
Get a FULL COMBO in 25 songs in HARD
Get a PERFECT in 25 songs in BASIC
Get a PERFECT in 25 songs in MEDIUM
Get a PERFECT in 25 songs in HARD
Get a B+ rating in over 10 plays
Get a B+ rating in over 100 plays
Get a B+ rating in over 300 plays
Get a B+ rating in over 1,000 plays
Draw graffiti with the item toy pen
Decorate with the item toy wallpaper ball
Take a photo of NEON with the item toy camera
Get 1,000,000 Rhythm Points
Complete Phase 1
Complete Phase 2
Complete Phase 3
Complete Phase 4
Complete Phase 5
Play end credits.