Here is the full list of all 28 One Hand Clapping achievements.
Climb Maestro Mountain
Activate the hidden sample machines in the Rhythm Village
Activate the hidden cave in the Tempo Drum section
Traverse Duet Desert
Escape Silent City
Wander Fugue Forest
Descend Coda Cave
Sail through Solo Sea
Return to Silent City
Hug the Melody Hermit for 15 seconds
Look out from the Mountain peak for 15 seconds
Complete the Nest Call and Response with high accuracy
Complete the Weefox Call and Response with high accuracy
Complete the Bell Shrine without any errors
Complete the Rhythm Village without any errors
Complete the Rhythm Temple without any errors
Complete the Lullaby Call and Response with high accuracy
Complete the World Tree canopy Call and Response with high accuracy
Complete the World Tree trunk Call and Response with high accuracy
Complete the Bad Apple section without any errors
Find the Weefox under the waterfall
Find the Silent City glyph
Find the Duet Desert glyph
Find the Maestro Mountain glyph
Find the Fugue Forest glyph
Find the Coda Cave glyph
Find the Solo Sea glyph
Find the Silent City: Reprise glyph