The current way the Diadem is set up it is extremely easy to get full "gold" credit for a fate or NM, but next to impossible to get actual "kill" credit unless you're in a full group who is all heavily contributing. By kill credit I mean the kill showing up on your evaluation card at the end and getting credit towards the Crown of Thorns achievement.

I have been trying to get this achievement done, but am finding it ridiculously frustrating. I've been in groups of four people, no credit, I've pulled the thing myself and kept hate for half the fight...no credit (even though I was under the assumption until recently that he who pulls it always gets full credit, like everywhere else in the game). I've done copious amounts of damage up and down left and right and still the counter doesn't budge, even when there is not a large mob of people at the NM.

It is becoming increasingly disheartening time and again sitting in instances way past the point I have any other reason to be there, alone, and then going all out on an NM only to get nothing for it. Please adjust the requirements so that if you get "gold" credit that is enough credit to count as a kill as well. Please.