Relentlessly Good Looking

Purchasable from Zom Bocom (Old Dalaran/Northrend):

1. 
   
2. [class=6]: [transmog-set=940]
3. 
   
4. [class=11]: [transmog-set=702]
5. 
   
6. [class=3]: [transmog-set=722]
7. 
   
8. [class=8]: [transmog-set=742]
9. 
   
10. [class=2]: [transmog-set=760]
11. 
    
12. [class=5]: [transmog-set=780]
13. 
    
14. [class=4]: [transmog-set=800]
15. 
    
16. [class=7]: [transmog-set=818]
17. 
    
18. [class=9]: [transmog-set=842]
19. 
    
20. [class=1]: [transmog-set=862]
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]
• 
  

• 
  
• [item=146574] (as an example) = 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) (you are here)
• 
  
• 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)
• 
  
• 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)
• 
  

So do you have to buy the ensemble for these achievements?
I had part of the set already, so bought the individual pieces I was missing.
The ensemble in the shop changed to 'already known' but I didn't get the achievement.
(I tried with season 6 set also, same deal).

In the end I had to refund them and buy the ensembles even tho I only needed 3 pieces so it ended up being more expensive...

For those just attempting to get the achievement Relentlessly-good-looking should consider purchasing the most of set from Goodman the "Closer" for gold, rather than using Mark of Honor.