This was a fairly straight forward cycle. I zoned in and began clearing all roaming mobs. Once the first named spawned, Old Dimshimmer, it then just cycled through each name by continuing to kill all trash. Perhaps it was good luck on RNG or it might be a cycle. I went Old Dimshimmer, Queen Nasheeji, Mina Glimmerwing, Crookstinger, and finally Whimsy Larktwitter. I never got a duplicate. Achievement completed in less than 2 hours at 65 just slaughtering roaming named. Having track is basically an essential on this one.
Edited, May 21st 2018 5:40pm by YoduhAgnarr