We’ve checked a few reports of this coming in and want to remind everyone that you must have killed Ashava during Server Slam at level 20. Killing Ashava during the March betas does not grant this trophy.
Being below 20 during the May test and killing Ashava does not grant the trophy. Killing Ashava in March at any level including 20+ does not grant the trophy.
This was a trophy exclusive to Level 20 kills of Ashava during the May Server Slam