Just noticed that there’s a couple new Defiant Map pack achievements. They are:
Don’t Touch That!
25G
Prevent the attacking team from touching the flag in a matchmade 1-Flag CTF game.
Paper beats Rock
15G
Assassinate a player that just exited Armor-Lock in a matchmade game.
All Alone
10G
Be the last surviving uninfected player in a matchmade Infection game.
What do you think?
Pretty cool. Easy.
By the way, even though you have a ‘Spoiler’ button in your post, you can still read the whole text by hovering over the thread title. 
It was almost fool proof.
Should have been ‘forever alone’
There’s about 10 new achievements, I should know, I unlocked one for 50g which was get 3 headshots in a row. I did it with the Sniper Rifle.
Does anyone know whether you can get the achieves on any map as long as you’ve downloaded the defiant and CEA map packs?
It seems you need to have CEA to get the new defiant achievements.
> Does anyone know whether you can get the achieves on any map as long as you’ve downloaded the defiant and CEA map packs?
You just need the map pack. No you don’t need to purchase the Halo Anniversary disc.