Lucky 7'sG 10

Lucky 7's G10:
Complete a puzzle where the last seven moves you make are correctly placing sevens

This achievement requires that you finish off a puzzle by correctly placing seven 7's at the end. This must be done in a standard Sudoku game initiated from the Main Menu and can be done on any difficulty. However, Hard or Expert is recommended so that there are enough numbers to fill in. When the board loads, you need to confirm that there are NO MORE THAN two 7's already filled in. If there are, reload until you get two or less. Complete the puzzle in any fashion you like, making sure not to fill in any 7s. Once all other numbers are filled in, proceed to add in the 7's and unlock the achievement.