Here is the full list of all 10 CrossCells achievements. It takes around 2-3 hours to unlock all of the achievements on Windows.
20/50 puzzles completed.
15/50 puzzles completed.
10/50 puzzles completed.
5/50 puzzles completed.
25/50 puzzles completed.
30/50 puzzles completed.
35/50
40/50
45/50
50/50