: Level 5 (Ding! Newbie) and playing as Lilith (Siren class).
I recommend against some of the Skag Pups for starters. Walk up to them and hit LB to phase walk and go behind one. R-click to melee behind one and the combination of melee and the shockwave of exiting should kill it easy.
The achivement name is a reference to [link=http://en.wikipedia.org/wiki/Jem_(TV_series
)]Jem and the Holograms
[/link], a 1980s cartoon about a singer name Jem (a siren), who is described in the series as "truly outrageous".