So I was just playing a game of CTF on Wayont, and I got the “Return To Sender” achievement. This achievement is only available in the Defiant map pack.
I don’t have the Defiant map pack…
Anybody care to shed some light on the matter? It’s probably something really simple that I’m just forgetting/don’t know.
Defiant and Noble Achievements are not limited to Map Packs. They can be achieved on any Matchmade Level such as Powerhouse or Paradiso.
Defiant Map Pack Achievements can also be achieved in Custom Games using some specific Gametypes but I’m not sure what they are called…
Oh wow. I had no idea :\
Looks like I have some achievements to get 
The TU update allows the achievements only available to Defiant and Noble Map Pack owners to be available all. Whether or not this was planned or an accident has yet to be determined, however you do not need to map packs to get the achievements.
I lol’d my friend was owned by Reach for the fourth time. He achieve 3 times “Totally Worth It” before he bought the map pack and some week before he did it again but this time he was on his friend console (which didn’t have the noble map pack), thus he didn’t get it -again-… Not like if he was trying to get it anyway, but you have to admit this achievment is more pure luck than anything. (get two player to suicide on a plasma grenade after your death)