Here is the full list of all 16 Majotori achievements. It takes around 4-5 hours to unlock all of the achievements on Windows.
Finish the game twice.
Win Hector's wish.
Win both Kony's and Oliver's wish.
Win all of Ava's wishes in one timeline.
Finish the game.
Be mentioned in the credits.
Make Xiang rich.
Make Nikola and Lariat go on a date.
Turn Sebastian into a master chef.
Mariano's relationship problems.
Change Shakespeare's ending.
Correctly answer all the questions of a trivia game.
Win a game of trivia.
Be trolled by the roulette going back.
A character died.
Lose a game of trivia.