Here is the full list of all 20 Microsoft Sudoku (JP) (Windows) achievements worth 200 gamerscore.
Win 12 Bronze Daily Challenge Badges
Win 8 Gold Daily Challenge Badges
Completed 100 Puzzles
Filled the board, leaving empty squares in an "X" shape in the center 3x3 block
Completed a puzzle on each difficulty
Solved 5 Very Easy puzzles in a row
Completed a puzzle where the last seven moves you made were correctly placing sevens
Solved 3 Expert puzzles in a row
Completed a puzzle on Expert difficulty without using any Guides or helper functions
Logged in each day of an entire month and completed at least one Daily Challenge
Completed all Daily Challenges in a month
Solved 100 Irregular Shapes
Finished a Symbol Sudoku puzzle by placing the last symbol in the exact center of the board
Drew 50 numbers on the board using a stylus OR placed 500 numbers
Won your first Daily Challenge
Used Show all Notes and then used Erase Notes with no other actions inbetween
Completed a puzzle in less than 1 minute
Completed your first puzzle
Completed a puzzle without using Notes
Solved a puzzle using all three Guide types, and consuming all the hints