Death sets you back 2%. Besides, I'm not amazing in crucible, and after 2 weeks I managed it get it done in two matches. It just takes patience. Trust me, it's easiest on zone control, just pop some skulls and have hand cannon reloader gloves. Edit: multi kills and killing sprees give extra points, regardless of what weapon did it so long as TLW is equipped. Specials and Heavies sometimes count.