The Denmark - The Vikings Add-on for Sid Meier's Civilization V has 11 achievements.
Win scenario on Deity (any civ)
Win scenario on Emperor (any civ)
Win scenario on Immortal (any civ)
Win as Anglo-Saxon England (any difficulty)
Win as Denmark (any difficulty)
Win as Norway (any difficulty)
Enter a snow tile with the Norwegian ski infantry
Win as Normandy (any difficulty)
Build a motte and bailey improvement
Pillage 9 Farms on the same turn
Beat the game on any difficulty setting as Harald Bluetooth