I think you should change it to something else or remove it.
You know well that pretty much everyone who got Ghor did it by multi-accounting and botting/scripting. Where would these players find lunatics willing to fight (and lose!) 750 times in a row against them?
Perhaps the clan wars will help with a faster and legitimate completion of this achievement, but it’s still nowhere near as feasible as the other ones. You can’t grind it yourself, you have to ask someone else. Unlike the winning achievements, it requires the active player to lose, which consumes energy.