Here is the full list of all 15 Nippon Marathon achievements.
Completed Story Mode with Zenbei
You chose Snuguru 20 times. (Player 1)
Completed Story Mode with Snuguru Maestro
Collected all Wedy Pages and became a Legendary Backpacker
Completed Story Mode with Nishibori
Well done, you went to the effort of finding a page from Wedy's Travel Guide and then, well, you ate it.
Whoa! You hit 3 strikes in a row in Go-Go Trolley Bowling!
You finished a Full Marathon, what impressive cardio!
Completed Story Mode with J DARWIN
Whoa! You finished a single race with 100% popularity, that is incredible! (Player 1)
100 Shiba Inus have been startled!
Wow! First place in a Half Marathon - You're half awesome! (Player 1)
You traversed 200 meters in LOBSTER mode
You were declared the smelliest - Get away from me!
Boo! You finished a Single Race with 0% popularity, you suck! (Well done) (Player 1)