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Viciously Vintage
Collect any class armor set from PvP Season 9.
Viciously Vintage requires you to collect any full class armor set from PvP Season 9, which can be purchased with 
Marks of Honor from vendors in Gadgetzan, Orgrimmar, or Stormwind.
Acquire Marks of Honor
You need either 
12 Marks of Honor to buy the ensemble (recommended if you have no pieces yet) or 17 Marks of Honor to buy all eight pieces individually: Chest (3), Head (3), Legs (3), Shoulders (2), Hands (2), Feet (2), Wrist (1), and Waist (1).
Visit a Season 9 Vendor
Purchase your Season 9 Vicious set from Blazzek the Biter in Gadgetzan, Tanaris; Doris Volanthius (Horde) in Orgrimmar; or Lieutenant Tristia (Alliance) in Stormwind. No old PvP rank is required to buy from these vendors.
Buy the Ensemble Instead
If you have no pieces yet, buying the ensemble for 12 Marks of Honor is cheaper than purchasing all individual slots for 17 total, and using the ensemble immediately grants the achievement upon unlocking the full set appearance.
Tips
If you purchased individual pieces but the achievement did not trigger, the items may have an active trade timer preventing them from being added to your collection — deleting, disenchanting, placing in Void Storage, or selling the item to a vendor for gold will immediately clear the timer, after which a relog may be needed.