Hour of Victory

while doing the flag captures and other miscellaneous achievements, make sure to grab any extra kill you can get. You'll get 50 kills while doing the flag returns as well. Then do any kills that you've missed on a deathmatch match on Manor house/Mansion.

Try to get 6 people to boost this! Simple as it can be, the booster kills the others at a specific point on the map.
I prefer the map "Estate". Meet in the middle of the map an the booster kills the other team.
Settings should be: Time: 30 min.
Typ: Domination

Then you can make as much kills as you can.