M&M was on my "buy when on sale" list. Shame that didn't happen. Reading from their site:
On The 13th of October we announced that Might & Magic Duel of Champions will no longer receive any additional updates. By doing so, we were able to offer you the game for a prolonged period of time, enabling you to play and enjoy it as long as possible. However, we have now decided to shut down the game for good.
{...}
Once 31st of October is upon us, we will continue with our final steps. This includes closing the game, but also its website, its forum and its social media channels. They will not be accessible to you any longer. That said, you will still be able to reach here our customer support and community management teams, even after the game has closed.
Given that the achievements are all tagged as "Online" I suspect they may well become discontinued soon (2016-10-31?). Those with the game but not the achievements should snag them while they can. If they still can at all.
Time not important; only life important.