Here you can buy Nemesis: Slayer of Sin'dorei
This quest starts and ends in Lunarfall. You need to kill 500 Goblin Players in PvP combat across Draenor.
Upon completion of this quest you will gain:
250 Garrison Resources
Slayer of Sin'dorei achievement
You will get uniqe achievement
250 Garrison Resources
Nemesis: Slayer of Sin'dorei achievement
"Slayer of Sin'dorei" 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