First, i hope no one has posted this strategy yet. I checked around and didn't see anything like it.
I was able to "solo" the Lurker Achievement on the beta servers. It's not all that hard, it just takes some planning. Here's what you need:
A way to walk on water
A way to avoid falling damage (slow fall, pally bubble, blink, etc.)
300(?) fishing skill
4-9 other players (not sure exactly)
1 other player
some way to kill yourself
The first obstacle is getting past the waterfall entrance. In method 1, the waterfall entrance opens up the way it normally would, by having a minimum number of raid members, which is either a total of 5 or 10 (I forget which).
In method 2, you only need one other player. Invite this person into a raid group, and they're part is done as long as they don't leave the group; they can go and continue to do whatever they want. Now go up to the waterfall and kill yourself. When you run back as a ghost, you will be able to run through the waterfall. Resurrect on the other side, and go in.
One other method is to have another raid group open up the waterfall for you, but you still need at least one other person in order to form a raid group and enter.
Once inside, however you did it, go to the ledge between the second elevator and before the first pull. Activate your water walking. Now jump off the ledge and fall to the water. Activate your method for avoiding fall damage. Now you can walk all the way to the Lurker's pool without any of those nasty fish getting in your way!
Lastly, be sure to remove any gear that you want to avoid taking durability damage. The achievement only requires you to fish him up, but he will instantly aggro you once you do so and very likely kill you.
You're now one achievement closer to the Salty title!