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