The achievement "Mark of [Location]: [Alphabet]" is missing an additional information where it should state that it should be Unique.

Here is the Shroud one:

"Slay 4 rank B elite marks in the Black Shroud."

I've probably murder so many bears and it didn't count because it wasn't unique. Mor Dhona's one (Mark of the Lake: [Alphabet]) is also missing an information because if it indeed requires unique elite marks, you can't get the achievement. Mor Dhona only has 1 Rank B/A/S; thus this is impossible to get. However, it is obtainable because the 2nd enemy required (vice-versa, assuming you did that area first) is from the Coerthas. That's right Mor Dhona and Coerthas are combined and the Achievement description doesn't say so.

This will cause some confusion but not a lot; but it is still worth reporting.
Gm Rohirthorn told me to bring it up here.