Here is the full list of all 57 Sudoku Zenkai achievements.
Shared 20 games.
Played 10 Zenkai games.
Played 10 Insane games.
Played 10 Challenging games.
Played 10 Fair games.
Shared 15 games.
Completed a Zenkai Sudoku without any helps!
Completed a Insane Sudoku without any helps!
Completed a Challenging Sudoku without any helps!
Shared 10 games.
Completed a Pushover Sudoku without any helps!
Completed a Fair Sudoku without any helps!
Played 10 Pushover games.
Shared 5 games.
Completed 20 games.
Completed a 20 winning streak.
Played 10 Trainee games.
Completed a Trainee Sudoku without any helps!
Completed a Challenging Sudoku under 15 minutes.
Shared 1 games.
Completed a Insane Sudoku under 20 minutes.
Completed a Zenkai Sudoku under 30 minutes.
Completed a Fair Sudoku under 10 minutes.
Completed 10 games.
Completed a 10 winning streak.
Completed a Pushover Sudoku under 7 minutes.
Completed a game with another emblem.
Completed 5 games.
Completed a 5 winning streak.
Played a game with 2 different themes.
Completed a game after 30 minutes!
Completed a game after 60 minutes!
Completed a game after 120 minutes!
Completed a game using a hint.
Completed a 3 winning streak.
Completed a Trainee Sudoku under 5 minutes.
Completed a daily challenge.
Completed a game without using annotations.
Completed 1 game.
Completed a game using Last Valid Board.
Completed a daily challenge with a friend.
Completed 50 games.
Played a game with every theme.
Played a game with every emblem.
Played 1 games with a friend.
Played 5 games with a friend.
Played 10 games with a friend.
Played 20 games with a friend.
Played 50 games with a friend.
Completed a Trainee game with a friend.
Completed a Pushover game with a friend.
Completed a Fair game with a friend.
Completed a Challenging game with a friend.
Completed a Insane game with a friend.
Completed a Zenkai game with a friend.
Asked a friend for help.
Helped a friend.