WoW Achievements — Browse All Achievements
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No Mercy
Collect any class armor set from PvP Season 2.
No Mercy is a 10-point achievement earned by collecting any complete class armor set from PvP Season 2, purchased with 
Marks of Honor from Izzee the 'Clutch'.
Decide: Ensemble or Individual Pieces
The ensemble (e.g. 
Merciless Gladiator's Felweave Armor) costs 
12 Marks of Honor and immediately unlocks all appearances plus the achievement upon use. Buying all 8 pieces individually costs 17 Marks of Honor total, so the ensemble is the cheaper and faster option if you have no pieces yet.
Purchase from Izzee the 'Clutch'
Visit Izzee the 'Clutch' and buy either the ensemble for 12 Marks of Honor or the individual pieces (Hands 2, Head 3, Legs 3, Shoulder 2, Chest 3, Waist 1, Feet 2, Wrist 1). No old PvP rank is required to purchase any of these items.
Clear the Refund Timer
If you bought individual pieces and the achievement did not trigger, the items still have an active trade or refund timer preventing them from being added to your collection — delete the items, disenchant them, or place them in Void Storage to immediately clear the timer and pop the achievement.
Tips
If you used the ensemble and the achievement did not trigger immediately, relog to force your collection to update.