I got 100% on kills for Polaris Lance Catalyst, but the problem is that no matter what I do, I don't get progress for the ''Perfect Fifth Kills whether I kill combantants with 5th shot explosion or if they die by taking the burn damage from the 5th shot. I hope this gets fixed for the next weekly reset by the time I've posted this topic. Also Polaris Lance might be my favorite weapon, and even better if you fix this Bungie!