Here is the full list of all 30 Sayonara Umihara Kawase achievements.
Clear Survival Challenge.
Clear Crab 2.
Play your own Replay 10 times.
Watch all Stage Tutorials.
Catch a Tadpole.
Clear Crab.
Fail a Stage 50 times.
Watch the Stage Tutorial of a Stage you've cleared.
Play Survival Challenge.
Acquire 10 backpacks.
Acquire two backpacks at the same time.
Clear the second door in a Stage.
Fail a Stage 20 times.
Browse the Illustration Gallery.
Clear Sayonara UmiharaKawase +.
Clear Tadpole.
Fail a Stage while holding a backpack.
Check all Walkthrough Tips in the Gallery.
Browse the Sound Gallery.
Acquire a backpack.
Unlock all Stages.
Clear all doors.
Use all characters.
Acquire 30 backpacks.
Acquire 45 backpacks.
Clear Balloonfish.
Clear Tadpole 2.
Clear all routes on Survival Challenge.
View everything in the Illustration Gallery.
Play everything in the Sound Gallery.