Monster Hunt 2 daily Achievement is not reasonable

I can understand the kill 800 mobs for the weekly achievement but kill 500 in day is not reasonable at all. Some days I have put in 6+ hours of playing and have never come even close to the 500 mobs per day. Also the achievement says kill 5000....which is a bug I think lol

I mean the monthly is only 3000 kills which if you did the 500 daily would give you roughly 15000 for the month lol