Complete any mission of Campaign on X difficulty or higher with X skulls (skulls optional) Best bet: Winter Contingency. You can skip about half of the level, and there are ways of getting around fighting 90% of the enemies. The ones you have to fight, you can usually cheat on.
I got 250 or so kills today, weekly challenge a long one, but can be done, good way to get lots of kills for me is SWAT, because you don't have to worry about taking people's shields down. 400 Firefight kills way kind of annoying, because of the amount, but still extremely easy. 50 automatic kills was the most annoying daily for me today, because I hate automatic weapons, and VERY rarely used them in Campaign (got my iron commendation from the challenge)
I like the firefight ones because it gives me a nice credit boost to my usual play time of firefight. This week's weekly is annoying for me because I prefer firefight and only play multi on weekends of if I have a friend over during the week when my classes are being tame.
Everybody I ask about Leadership element just says to do the Target Locator BS : / I think that any mission you do will work as long as you have thunderstorm on. I believe Ultras count as leaders.
Last stand works perfectly, I believe all elites there count as leaders. I just did it normal with no skulls on, and every elite kill counted. It works the best because there is allways an elite to fight.
For any "Kill X of Anything in anygame type in reach", just go to ONI, turn on the skulls you need, and do the boosting trick. It should get you a ****-tonne of kills in no time.
I've done both, and this feels faster to me. But some of them say "In Campaign" so this is still a legitimate strategy if even if custom firefight is faster
For the "X amount of kills", I just set up a guest account in forge, one respawn point, tape down the right trigger and watch TV. Laziness all the way, dudes.
Lol, at least play Gruntpocalypse or something. Though, hey, I suppose it works. I've managed to maintain a record of no Campaign/Firefight challenges done on my GT, every single one I've done has been MM. Even the 400 kills in any game mode is relatively easy if you just stick at it, didn't take me more than a couple of hours of MM which I play most days anyway. The sheer amount of MM I've played has put me in the top 1% on more than a couple of the more specific HaloCharts leaderboards, though what'll be more satisfying is seeing if I can stay there when the number of players being tracked on HC is actually high enough for that to mean something.