34 PH clears before I got this guy to show.
Toskirakk is sorta different for Hunter Achievement in that the nameds spawn fairly rarely BUT the PHer respawns quicker than normal, more like 5-6 minutes. So if you camp a named and stick at it, clearing as fast as the PHer spawns, you're likely to see a named pretty quickly.
Fortunately 5 nameds all spawn in the central area fairly close to each other; the rest are fairly scattered making it annoying to clear them one after the other.
An annoying Hunter task which I'm very pleased so see the backside... of.