No mater the type of kill, headshot with fifth round kill, explosion kill, burn damage kill, the counter does not move, I've had this catalyst since warming dlc released and never felt like getting 50 perfect fifths burn damage kills, but now that solar 3.0 is out I thought maybe bungie changed the burn damage to scorch damage, and that it would be easier to complete the catalyst, but now it seems to not even work at all.