Here is the full list of all 20 Sumoman achievements.
Eat two sushi rolls hovering over the bridge.
Smash something.
Smash something by your head.
Run like a wind.
Jump upon junk boat roof like a pirate.
Find California Roll on Japanese islands.
Сomplete tutorial.
Find all hidden sushi rolls in the home village.
Eat everything you can find in the dark wood.
Eat black sushi rolls in the Ninja Dojo.
Eat the dinner of famous ninjas.
Break into the Mugen Monastery.
Visit three taverns in the night city.
Get out from the dungeon.
Eat all Wasabi rolls in the dungeon.
Find the Dreamstone.
Rewind 15 minutes back.
Become the master of Ninjutsu.
Reach the Maegashira rank.
Reach the Yokozuna rank.