I have been very recently been awarded the Dragon's Hoard (I think) and Dragon's Hoard (Advanced) achievements, the latter described as "Obtain a collection of 10 magic items." I can't see how it's appropriate, but I could be wrong, so I'm posting here rather than immediately under Bugs.
I have one indubitable magic item, a pair of Renaissance-era trousers acquired today, labeled "Experienced Pilgrim Bottom"--I'll propose a label less subject to double entendres when and if I've thought of one--and further labeled "(Enchanted Artifact)". Which would explain the first award, if that is as I suppose given for getting just 1 magic item.
Otherwise, I have long had rather more than 10 items that any rational observer would call magic, those that inexplicably disguise the size of my army and the amount of my resources, increase my production, or increase the power of my troops at attack or defense. But each of those is labeled simply "(item)"--and I never noticed any achievement related to them until now.
So is this my user error and/or ignorance, or a Trivial bug?