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Here you can buy Nemesis: Manslayer
This quest starts and ends in Frostwall. You need to kill 500 Human players in PvP combat across Draenor.
Upon completion of this quest you will gain:
250 Garrison Resources
Manslayer achievement
You will get uniqe achievement
250 Garrison Resources
Nemesis: Manslayer achievement
"Manslayer" title
builded Gladiator's Sanctum at least Level 2 in your Draenor Garrison
if you have level 2 sanctum, you can get the quests then. Possible to build it in 2 hours if you don't have it yet.
Alliance and Horde have different titles and achievements