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Adventurer of Zereth Mortis
Complete the following special encounters in Zereth Mortis.
Adventurer of Zereth Mortis requires you to slay 7 specific rare enemies across Zereth Mortis, and is part of the larger From A to Zereth meta-achievement.
Kill Gluttonous Overgrowth
Find Gluttonous Overgrowth at 53.08, 93.06 in Zereth Mortis. You must pull out 5 Bulging Roots during this encounter to progress the fight.
Slay Feasting
Defeat Feasting at 61.82, 60.61 in Zereth Mortis. This rare has a chance to drop the 
Visor of Visceral Cravings helm.
Defeat Sand Matriarch Ileus
Engage Sand Matriarch Ileus at 53.39, 47.08 in Zereth Mortis. Be aware that she burrows underground at 50% health, so be prepared for her to temporarily vanish.
Kill Akkaris
Akkaris is a giant worm found at 64.67, 33.82 in Zereth Mortis, sitting on top of a Sandworn Chest. Akkaris does not spawn every day, so you may need to return on a different day.
Reach and Kill Tahkwitz
Tahkwitz is located high above ground at 49.99, 40.02 in Zereth Mortis and requires either completion of main story chapter 6 or a flying spell to reach.
Defeat Orixal
Find Orixal at 54.71, 68.75 in Zereth Mortis. Note that Orixal shares a cooldown with the Overgrown Helicid, meaning only one of the two will be available at a time.
Slay Vitiane
Vitiane is located at 47.06, 46.97 in Zereth Mortis and hits hard, channeling a spell called Dreadful Pulse. Vitiane does not spawn every day, so check back if she is not present.
Tips
Several rares — including Akkaris and Vitiane — do not spawn every day. You can check the front page of wowhead.com under the Notable Zereth Mortis Rares list to see which limited-spawn rares are currently up.
The full list of rares that do not spawn every day includes: Akkaris, Chitali the Eldest, Euv'ouk, General Zarathura, Gorkek, Hadeon the Stonebreaker, Sorranos, Tethos, Vexis, Vitiane, and Xy'rath the Covetous.
Farming on a lower-population server can make rare hunting significantly easier, as competition for spawns is reduced.