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