Athelton Jones gives you the quest "A Surprising Investigation", in which you have to identify 5 imposters.
Imposter #1 - Reshad
The imposter Reshad is on the Fashion Frenzy stage at 63.04, 49.24.
Imposter #2 - Maru
The imposter Maru is at the Pet Playground area at 61.91, 49.90.
Imposter #3 - Lorewalker Cho
The imposter Lorewalker Chop is outside of the ice rink at 61.65, 51.05.
Imposter #4 - Jepetto Joybuzz
The imposter Jepetto Joybuzz is outside of the Story Time at 63.79, 51.76.
Imposter #5 - Big Kinook
The imposter Big Kinook is outside of the Dark Iron Mole Miner at 63.02, 49.86.
The order of imposters does NOT matter, you can get them in any order.
/way #71 63.04, 49.24 Reshad - Imposter
/way #71 61.91, 49.90 Maru - Imposter
/way #71 61.65, 51.05 Lorewalker Cho - Imposter
/way #71 63.79, 51.76 Jepetto Joybuzz - Imposter
/way #71 63.02, 49.86 Big Kinook - Imposter
/way #71 61, 50.72 Athelton Jones
When you return to Athelton Jones, he'll have you hand out 10 letters. These are basically a small AoE targeted cast, just toss them at most named NPCs to get your 10.
Finally, Detective Jones has you go obtain a "Lucky Feast". Go to Bonenose in Tanaris at 60.91, 44.73 to pick up the feast.
/way #71 60.91, 44.73 Bonenose
He'll send you to the Northern Beach, which is in Tanaris at 65.82, 41.76.
/way #71 65.82, 41.76 Athelton Jones
Talk to Athelton Jones, then see Alyx nearby at 66.21, 40.94 to complete the quest and the achievement!
/way #71 66.21, 40.94 Alyx