This is how to get the Jenkins Title EASILY as a Marksman Hunter (1-3), its easier with more, but you can do with two more.
This is the title on my hunter.
You need a group of three total sadly to get to the room, but you can have more players with.
But it is HIGHLY recommended to have a Tank and a Healer, but there is some who did without.
But its too easy if three Marksman Hunters.
First you need Readiness and Deterrence, then all you need to do is make all get the whelps, then go togheter in middle, fire up Explosive Trap - then Readiness - go for a second Explosive Trap.
Now, just Deterrence for the dodge+parry.
That is 6 Explosive Traps, and 3 volleys would do well as well.
This is for the achivement "Leeeeeeeeeroy!", which grants a title Jenkins.
Noob Jenkins (example of a character named Noob.)
There is 50 whelps to kill in 15seconds.
P.S disklaimer : Might die if it fails...