Here is the full list of all 24 Rhythm Doctor achievements.
Enter the "Rhythm Dogtor" code.
Complete Act 1.
Complete Act 2.
Complete Act 3.
Complete Act 4.
Save the Insomniac patient and watch the game's credits.
Earn an S-Rank on Level 1-X.
Earn an S-Rank.
Complete the Muse Dash Collaboration.
Earn an S-Rank on Level 1-2.
Earn an S-Rank on Level 2-2.
Earn an S-Rank on Level 2-3.
Earn an S-Rank on Level 2-3N.
Earn an S-Rank on Level 3-1.
Earn an S-Rank on Level 2-X.
Earn an S-Rank on Level 3-X.
Earn an S-Rank on Level 4-1.
Earn an S-Rank on Level 4-1N.
Earn an S-Rank on Level 1-XN.
Earn an S-Rank in Beans Hopper.
Receive a Score of 0 in Beans Hopper.
Complete any level in 2-Player Mode.
Give Dr Edega a headache in the Level Select menu.
Get scolded by Dr Edega in the Level Select menu.