Ways to get the mister chief helmet and others?

Games Halo: The Master Chief Collection
1

I want that lucky shot skin and the mister chief helmet. Know some tactics?

2

Play Ranked matches and win. Try playing more than just one playlist if you’re going solo because it becomes harder to win as your reach higher ranks.

3

For Who, What, Win, don’t do what I did, which was solo queuing. Search Ranked matches with good players. I recommend doing Halo 3 Team Slayer. For the challenge that makes you get 343 BR Headshots, go into SWAT for H2C, H2A, H3, and H4 or you can do it at the same time as Who, What, Win. There’s plenty of guides for Because You Begged. However, you could be assassinating the Elite correctly and it won’t unlock because there’s a bug. If you’ve assassinated the Elite a ton of times with no success, click on this link and follow the instructions