General Subcategory Missing when parsing Achievements

[QuantumPie]

I'm using the following code to parse through all the achievements in the game:

for topLevelIndex = 1, GetNumAchievementCategories() do
            local categoryName, numSubCatgories, _  = GetAchievementCategoryInfo(topLevelIndex)
            d(categoryName)
            if self.svAccount.achievements[categoryName] == nil then self.svAccount.achievements[categoryName] = {totalPoints = 0, categoryIndex = topLevelIndex, subCategories = {}} end
            for subCategoryIndex = 1, numSubCatgories do
                local subCategoryName, numSubAchievements = GetAchievementSubCategoryInfo(topLevelIndex, subCategoryIndex)
                if self.svAccount.achievements[categoryName]["subCategories"][subCategoryName] == nil then self.svAccount.achievements[categoryName]["subCategories"][subCategoryName] = {} end
                for index = 1, numSubAchievements do
                    local id = GetAchievementId(topLevelIndex, subCategoryIndex, index)
                    local name, _, points, _, completed, date, _ = GetAchievementInfo(id)
                    if self.svAccount.achievements[categoryName]["subCategories"][subCategoryName][name] == nil then self.svAccount.achievements[categoryName]["subCategories"][subCategoryName][name] = {id = id, characters = {}} end
                    if completed then
                        local characterArray = self.svAccount.achievements[categoryName]["subCategories"][subCategoryName][name]["characters"]
                        characterArray[#characterArray + 1] = {name = playerName, date = date}
                    end
 
                end
            end
        end

When I use Zgoo to inspect the saved variables, I noticed that the general sub category was only recorded for the category of Harrowstorm and Stonethorns (the two most recent dungeon DLCs). It was missing from every other category. If this is the intended behavior, how do I capture the general subcategories? I don't see any other functions from the API page on the wiki which could give that info.