After finding 25 journal fragments in strikes you have to acquire 10,000 points in kills in the crucible. From Jason's info it seems that you get 50 points per kill but lose 15 points for every death. But official sources say there's no negative affects from dying so we'll see. Meaning you need to get at least 200 kills in the crucible. The Pulse Rifle is Bad Juju. Happy hunting. ~ Blingbling