Microsoft Minesweeper

Just select the previous month, then the 1st day, play one challenge, go to day 2 and keep doing that
Should pop right after you finish playing the last challenge!

This works perfectly. Achievement popped right after finishing the last day of February 2023

Building on everyone's work here, I think my experience just getting this will be useful to someone. I actually used the date change trick earlier this month. I picked a month last year and went through days 1-31 in order playing one challenge for each day. Achievement popped in the game at 31 but then when I changed the time back to the present it didn't pop in the system and all my progress was deleted when it synced to the system.

Today being the end of the month, I decided to do it all over again for the present month. In this case, when I got to the last day of the month I just change the date back to "set time automatically" and the system will be synced as well. It worked perfectly.

Some notes:

1. I did NOT disconnect my internet connection for any of this. I only changed the date manually by right-clicking bottom right time/calendar and selecting "adjust date and time."

2. I only started Minesweeper once and never closed it, although I returned to the main screen from the Daily Challenges before changing the date each time. (I don't know if this was necessary but that's how I did it.)

3. After completing a daily challenge and backing to the main screen and then changing the system date, the prior day would still show on the Daily Challenges. Ignore it, but after selecting Daily Challenges make sure to press the right arrow to the next day (which won't be greyed out because you already changed the system date). After pressing right to the "present" date, play one challenge and then back to the main screen and change to the next date and so on.

4. As I mentioned above, once I got to the actual last day of the month (which was the real date), I just reset the system back to "set time automatically" and then just played one challenge for the true present day as normal. All the credit for the prior days of the month was properly given as though they had been played on their respective days and the achievement popped normally as I completed this last daily challenge, which was the only one done on the actual true date.

5. This didn't take very long at all just playing an easy challenge from each day after changing the date. The most annoying part was the 30 second ads for each play.

I had the same issue, did all of February by the book, but the achievement did not pop yesterday. However it did pop today after I followed the instructions from this post:

Basically, set your computer date to January 31st, complete one challenge on that day, close, set date to January 30th, complete one challenge on that day, close, set date to January 29th, complete one challenge on that day, close, set date to February 28th, (re)complete one challenge on that day (even if you did all 3, just do one again) then the achievement pops :) It seems the game is tracking the past 31 days instead of tracking the actual month?

Would not let me download, said it is not secure. Is there a way to get around this?

Update: Was able to download and was able to pop the achievement.

This has been the last achievement for me for so long, and this finally got it to unlock for me. Thank you so much! I can finally uninstall this mess and move on with my life. It does list the file as unsecure, but you can click on 'Keep Anyway' or something like that to install it.