For example…
Yakslapper Destroy 1,000,000 total caravans in WvW.
… seriously? If you kill a caravan every 2 minutes for 12 hours a day, 365 days a year, this achievement would take… wait for it…
7.6 years (do the math yourself… it’s true)
Who the heck is going to waste 7.6 years of their life doing nothing but strinting between caravans chopping the heads off Yaks in WvW (and ignoring every other part of guild wars and their entire life for that entire time)?
…and this is just one example. I don’t think that ArenaNet thought these numbers out very carefully. 
