Most of the gallery unlocks come through playing the game modes and characters - complete a survival route with a character and you'll their character profilein the Illustrations bit, for instance. I've got a handful of illustrations still locked down despite having everything else so I'm guessing those unlock on the harder survival routes? Other than the first tadpole (edit: and the first crab) the survival routes look pretty mean, especially given the low number of starting lives.
If you have any particular queries, ask away - someone around here probably knows.
Here's the list:
Until We Meet Again - Earn all trophies for Sayonara UmiharaKawase +
Gone Fishin’ - Clear Sayonara UmiharaKawase +
Almost There! - Unlock all Stages.
Who Needs Doors? - Clear all doors.
Golden Oldie - Play the original Umihara Kawase.
Old School Umihara - Watch the ending of the original Umihara Kawase
The Whole Gang - Use all characters.
Outdoorsy Type - Acquire a backpack.
Backpacker - Acquire 10 backpacks.
Superpacker - Acquire 10* backpacks. (Typo on trophy, should be 30)
Perfectpacker - Acquire 45 backpacks.
Froggy Fun - Clear Tadpole **Hidden Trophy**
Crabsolutely - Clear Crab **Hidden Trophy**
Prickly Customer - Clear Porcupine Fish **Hidden Trophy**
Froggy Fever - Clear Tadpole 2 **Hidden Trophy**
Crabulous - Clear Crab 2 **Hidden Trophy**
Rise to the Challenge - Play Survival Challenge.
Made It! - Clear Survival Challenge.
I’m a Survivor! - Clear all routes on Survival Challenge.
Art Enthusiast - Browse the Illustration Gallery.
Art Collector - View everything in the Illustration Gallery.
Music Enthusiast - Browse the Sound Gallery.
My Ears Are Happy! - Play everything in the Sound Gallery.
Helping Hand - Check all Walkthrough Tips in the Gallery.
Study Fiend - Watch the Stage Tutorial of a Stage you’ve cleared. **Hidden Trophy**
Ready for Anything - Watch all stage tutorials. **Hidden Trophy**
Self-Appreciation - Play your own Replay 10 times. **Hidden Trophy**
You’re Mine! Catch a Tadpole. **Hidden Trophy**
Back Entrance - Clear the second door in a Stage. **Hidden Trophy**
Heavy Load - Fail a Stage while holding a backpack. **Hidden Trophy**
Extra Storage - Acquire two backpacks at the same time. **Hidden Trophy**
Keep At It! - Fail a Stage 20 times. **Hidden Trophy**
It All Builds Character - Fail a Stage 50 times. **Hidden Trophy**
Taken from
http://invertedaccess.com/2015/05/04/sayonara-umiharakawase-english-trophy-list/I've altered the walkthrough/replay trophies above to be listed as hidden, despite what that site says (I didn't have them unlocked and had to check what they were), there are probably several more that start out hidden that I can't now check. If anyone knows any others I'll edit this post.