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