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