Been hunting since it was introduced in patch 2.3. Sitting at 301 S rank kills and 1,052 A rank kills. I've probably spent more time not hunting than actively hunting. I've echo'd more hunts than I've attended by at least four-fold. The only times I've hunted are when the upgrades come off of lock from raids and I can freely gear up other classes. It's not a hardcore achievement, but it does require time investment if you want the achievement "quickly."

People also forget there will be content droughts. Time periods where a ton of people are unsubbed waiting for a new patch to hit- these are your absolute best times to work on achievements like this one.