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