Here is the full list of all 13 Umihara Kawase achievements.
Reach to one of the endings
Play the game with 5-min. rule
Clear Tadpole
Reach to ALL endings
Reach to ALL stages
Clear ALL the doors
Clear Parrot fish
Clear Crucian carp
Clear Crab
Clear Tadpole 2
Capture ALL the enemies
Get all backpacks
Reach to the last field, after playing more than 30-min.