Are you still active on this wiki? I can see that you're not that active on the wiki anymore, so I'm thinking that I can assist you with managing the wiki. I play Mage Gauntlet quite regularly, so I can say I have a considerable knowledge of it. Can you give me admin rights?
I unfortunately don't play Mage Gauntlet anymore, last time was maybe 5 or 6 years ago. Same goes for the contribution to this wiki, at least for me. You might have some more luck asking the other main contributors of the Mage Gauntlet wiki like Oldchiangkee or SirDarkened, hopefully they can help you.
As for the Archmage achievement, I remember this one being was a bit buggy and required to play some levels again (don't know which ones though). You can also try to log out from Gamecenter or Google Play and log back in, this might fix it. And if both fails, the only other option is a hard reset and play the game over again, if you're up for it. It sucks, I know, but I also had to do it the hard way just to get this achievement.