Cataclysmic Catwalk

Purchasable from Sergeant Thunderhorn (Og) and Captain Dirgehammer (Sw):

1. 
   
2. [class=6]: [transmog-set=1228]
3. 
   
4. [class=11]: [transmog-set=1236]
5. 
   
6. [class=3]: [transmog-set=1230]
7. 
   
8. [class=8]: [transmog-set=1238]
9. 
   
10. [class=2]: [transmog-set=1226]
11. 
    
12. [class=5]: [transmog-set=1240]
13. 
    
14. [class=4]: [transmog-set=1234]
15. 
    
16. [class=7]: [transmog-set=1232]
17. 
    
18. [class=9]: [transmog-set=1242]
19. 
    
20. [class=1]: [transmog-set=1224]
21. 
    

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Prices:

1. 
   
2. Hands = 2x [item=137642]
3. 
   
4. Head = 3x [item=137642]
5. 
   
6. Legs = 3x [item=137642]
7. 
   
8. Shoulder = 2x [item=137642]
9. 
   
10. Chest = 3x [item=137642]
11. 
    
12. Waist = 1x [item=137642]
13. 
    
14. Feet = 2x [item=137642]
15. 
    
16. Wrist = 1x [item=137642]
17. 
    

• 
  
• Total: 17x [item=137642]
• 
  

• 
  
• Ensemble = 12x [item=137642]
• 
  

If you want the achievement and don't have any pieces yet, the ensemble is cheaper.
Consider the two-hour exchange period when you buy parts of the set instead of the ensemble and make sure you get the achievement before selling the item.
You don't need an old pvp rank to purchase these items.

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Achievements for Pvp-Appearences:

• 
  
• Season 1: The Original (BC)
• 
  
• Season 2: No Mercy (BC)
• 
  
• Season 3: With a Vengeance (BC)
• 
  
• Season 4: Tough Threads (BC)
• 
  
• Season 5: Lethal Looks (Northrend)
• 
  
• Season 6: The Fierce and the Furious (Northrend)
• 
  
• Season 7: Relentlessly Good Looking (Northrend)
• 
  
• Season 8: Wrath of the Stitch King (Northrend)
• 
  
• Season 9: Viciously Vintage (Cata)
• 
  
• Season 10: (Ruth)less is More (Cata)
• 
  
• Season 11: Cataclysmic Catwalk (Cata) (you are here)
• 
  
• Season 12: Why Male(volent) Models? (MoP)
• 
  
• Season 13: Dressed to Oppress (MoP)
• 
  
• Season 14: It's Not Fashion Unless It Hurts (MoP)
• 
  
• Season 15: Wear It With Pride (Draenor)
• 
  
• Season 16: Untamed Beauty (Draenor)
• 
  
• Season 17: Wild Style (Draenor)
• 
  
• Season 18: War-Mog-ering (Draenor)
• 
  
• Season 19 or 20: More Like Win-dictive (Legion)
• 
  
• Season 21 or 22: Cruel Intentions (Legion)
• 
  
• Season 23, 24, 25: Claws Out (Legion)
• 
  

PvP Season 11 'cataclysmic' sets can now be purchased with Marks of Honor from Captain Dirgehammer (A) and Sergeant Thunderhorn (H)

List of sets by class

I'm confused. I have the full set on this now. However I haven't got the achievement.
See the screenshot here.

https://www.dropbox.com/s/hy06jvviiaskzpz/Screenshot%202017-04-21%2014.08.43.png?dl=0