Here is the full list of all 50 Mushihimesama achievements.
Complete Arrange mode with no continues. （Arrange only)
Complete the Maniac mode with no continues. (Normal, Novice only)
Complete STAGE 3 in Ultra mode with no continues! (Normal, Novice only)
Go over 70,000 in fire count. (Normal, Novice only)
Complete without using any bombs. (Normal, Novice only)
Complete the Original mode with no continues. (Normal, Novice only)
Defeat Benihonogada without breaking its legs. (Normal, Novice only)
Complete Maniac mode. (Normal, Novice only)
Display any of the following: detailed score, lever, extra window.
Open the sound customization menu.
Play a replay.
Complete Ultra mode! (Normal, Novice only)
Go over 40,000 in fire count. (Normal, Novice only)
Complete Arrange mode. (Arrange only)
Defeat Aki and Akka. (Arrange only)
Defeat boss in STAGE 5. (Arrange only)
Defeat boss in STAGE 4. (Arrange only)
Defeat boss in STAGE 3. (Arrange only)
Defeat boss in STAGE 2. (Arrange only)
Select the Ultra mode. (Normal, Novice only)
Obtain 1UP. (Normal, Novice, Arrange only)
Defeat boss in STAGE 5. (Normal, Novice only)
Start training.
Complete Original mode. (Normal, Novice only)
Defeat miniboss in STAGE 5. (Normal, Novice only)
Get a score extend. (Normal, Novice, Arrange only)
Change to M-POWER (Normal, Novice only)
Break all of Benihonogada's legs. (Normal, Novice only)
Defeat boss in STAGE 4. (Normal, Novice only)
Defeat miniboss in STAGE 4. (Normal, Novice only)
Change to W-POWER (Normal, Novice only)
Defeat boss in STAGE 3. (Normal, Novice only)
Change to S-POWER (Normal, Novice only)
Defeat boss in STAGE 2. (Normal, Novice only)
Fire at Nanabusshi and obtain a lot of amber. (Normal, Novice only)
Defeat miniboss in STAGE 2. (Normal, Novice only)
Start with M-POWER (Normal, Novice, Arrange only)
Obtain bomb berry. (Normal, Novice, Arrange only)
Defeat boss in STAGE 1. (Arrange only)
Start with S-POWER (Normal, Novice, Arrange only)
Obtain FORMATION options. (Normal, Novice, Arrange only)
Change to FORMATION. (Normal, Novice only)
Defeat boss in STAGE 1. (Normal, Novice only)
Obtain TRACE options. (Normal, Novice, Arrange only)
Change to TRACE. (Normal, Novice only)
Play the game. (Normal, Novice, Arrange only)
Start with W-POWER (Normal, Novice, Arrange only)
Defeat Aki and Akka. (Normal only)
Go over 150,000 in fire count. (Normal, Novice only)
Went over 200,000 in fire count. (Normal, Novice only)