function ADVR.onLoad()
    achievement.psvrID = 8
	achievement.hideDescription = false
    achievement.unlocksItem = relics.THRESHING_BLADE
    achievement.predecessors = {achievements.THE_BLACKSMITHS_ANVIL}
    achievement.category = "collection"
    
    ValidNpcIds = {
        "blacksmith_crossbowdagger_primary",
        "blacksmith_crossbowdagger_secondary",
        "blacksmith_swordknife_primary",
        "blacksmith_swordknife_secondary",
        "blacksmith_magicwand_primary",
        "blacksmith_magicwand_secondary",
        "blacksmith_flailbomb_primary",
        "blacksmith_flailbomb_secondary"
    }
end

function ADVR.onProgressBought(npcId)
    local isValidNpc = false
    for _, validId in ipairs(ValidNpcIds) do
        if npcId == validId then
            isValidNpc = true
            break
        end
    end
    
    if isValidNpc == false then
        return
    end

    UnlockAchievement()
end

function UnlockAchievement()
    achievement.Unlock()

    -- Refresh the achievement UI.
    game.RefreshHomeBaseUIs()
end

-- Failsafe as there are bug reports... 
function ADVR.onSpawnInHomeBase()
    for _, npcIdKey in ipairs(ValidNpcIds) do
        if HasBoughtOneUpgrades(npcIdKey) == true then
            achievement.Unlock()

            -- Refresh the achievement UI.
            game.RefreshHomeBaseUIs()
            return
        end
    end
end

function HasBoughtOneUpgrades(npcIdKey)
    for progressRepresentation in game.progressHandler.GetProgressesByNpc(npcIdKey) do
        if progressRepresentation.IsBought() == true then
            return true
        end
    end
    return false
end