Guild Wars 2

https://forum-en.gw2archive.eu/forum/support/bugs/Some-finishes-failed-to-count-for-achievement
He has a wrong count becouse he used many of them and he make only 3/20.
I had the exact opposite issue, i used 9 Mad King Finishers and i obtained the Achievement. Probably interrupted ones are counted in the achievement but not in the used Finishers. This is good for me becouse i did it faster but it’s a bug so i reported it.

Well don’t exploit it in the mists practice area and there shouldn’t be any issues. I did all mine on players in spvp, no problems.