Eggs in One Basket

Achievement designer 1: "Check out this cool achievement I just made, it requires killing mobs in a short space of time!"
Achievement designer 2: "Yeah that's pretty cool. Hey you know what would make it even cooler?"
Achievement designer 1: "What's that?"
Achievement designer 2: "If the mob density and respawn times were so %^&*house that if anyone else was there with you the achievement would be near impossible!"
Achievement designer 1: "And we make the achievement only completeable when the daily is up, funneling heaps of people into the area!"
Achievement designer 2: "Genius!"

This is what I did:

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• Start at the circle of prisoners at 55.2, 8.6
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• Free 4 prisoners while my bodyguard+CC keeps the mobs that patrol around the circle busy so i can kill them after all 4 are free
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• Kill everything in the area, including the two robots that aren't moving and any birds flying by
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• Move up the ramp to the area with the 4 robots at 54, 9 and kill them
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• Double back and kill any respawns in the previous area, this should get you very close to 100
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• Return and go up the ramp towards 53, 8 in the direction of where the Solar Magnifier spawns and kill anything on the way
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• Turn them in at 51.8, 5.5. If you're not quite to 100 then detour west to grab some mobs from over there, then hightail it back over to turn them in
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Major note: Do not leave the area while doing this because it resets your morale meter.

Since you're here to complete this achievement, you're probably looking at Fish Gotta Swim, Birds Gotta Eat as well, my suggestion is you do that one first, because the fish that drops from the birds give 60% versatility, and lasts 30 minutes, so what you could do is gather up 4 keys, go to the water at 54,10 and wait for the birds to grab the fish and kill it, then depending on how much in a hurry you are, you could wait for more birds to grab fish because the versatility buff stacks. I got 2 of them almost back to back and I was on 123% versatility, which means 123% more damage and 61.5% reduced damage taken, Eggs in One Basket was very easy to get after that because you can pull many more mobs, and they die a lot quicker.