Hurk Deluxe DLC is part of the main story (campaign)....
... the rest is embedded in the first title/menu screen. There is no order to play the DLCs since it's not part of the main campaign - it's a mere top-up for a bit more shooting/hunting and hence a few more awards to achieve. .
The map browser (main screen) offers community created maps and it's mostly worthy stuff to play trough.