Here is the full list of all 13 Fruit Sudoku achievements.
Finish the 1st sudoku
Finish 50 sudoku games
Finish 100 sudoku games
Finish the game with an apple
Finish the game with a Watermelon
Finish the game with a Cononut
Finish the game with a Grapes
Finish the game with a Cherry
Finish the game with a Pear
Finish the game with a Lemon
Finish the game with an Orange
Finish the game with a Banana
Finish a very hard game without any tips or annotations