EDIT 2: The recent Patch appears to have fixed the glitch so this achievement should be available for all now WARNING: This achievement is currently glitched for those who have this achievement already on the WP version. I will update this guide should a patch come available, but for now it seems to be unobtainable Original SolutionVery simple
achievement to get if you know what you're doing.
From the main menu choose Classic mode on Easy or Intermediate. You are looking to click on a blank space on your first go so that it opens up a large section of the board. If you don't get it on the first click, I would restart.
When you have opened up a large area, look for the numbers 1-2-1 in a row. This is a special combination in minesweeper and the mines will always be in the same place. All you need to do is click the square in the middle, the one next to the number 2, within 3 seconds. You don't need to flag the ones with mines only reveal the empty square.
Once you have done this, deliberately hit a bomb to fail the game. This version of minesweeper will let you restart the board you just failed, so click Play same board again. Now all you have to do is open up the same area again, click in the middle square again, and then deliberately fail. Repeat this process 19 more times and voila, you have your achievement!
All in all this process took me about 3 minutes.
Hope that helps. I have tried to be as clear as possible. Please let me know if you have any questions!