We can unlock by completing Eight quest out of nine in Horde Rush Mode.
There are 9 quests are given. You have to complete any 8 to grab Bling.
Like Colle,ct score multipliers Earn a team score of at least 350,000 points in a single match
When you complete any quest you shall rewarded with some experience pts.
Click on Learn more to know, Which quest you have to complete and how you can complete these quest easily in video form.