Now I'm going to hold off on my opinion and try not to rant about the massive amount of DLC already, so here is some info from the website
Your memories of the battle of Ostagar will haunt you for years to come. It laid waste to your order and claimed the lives of many great men and women.
Now, there are rumors that a fellow survivor of the battle has escaped from captivity and is seeking the Grey Wardens' help. The time has come for the Grey Wardens to make their return to Ostagar and exact their revenge upon the darkspawn.
screens
* A return to the battlefields of Ostagar, now thick with darkspawn encamped amidst the snow
* An opportunity to reclaim the lost arms and armor of a king
* A second chance to add Dog to your party
Now I don't have any more info in regards to achievements at this point, but based on the first two having 2 achievements worth a total of 50 GS per DLC (4 for 100 total) it would be logical to assume this DLC will contain at least the same amount.
For more info about the game, check out Dragon Age's website, or check out my review of the game (shameless plug!!).