Here is the full list of all 33 Age of Viking Conquest achievements.
Play at least 5 multiplayer games
Play at least 3 games
Use all 20 move orders in one same turn
Hold a treasury of above 10,000 gold pieces
Have conquered the whole map with each nation (once each at the minimum)
Conquer all the Map with Sweden
Conquer all the Map with Norway
Conquer all the Map with Denmark
As a Viking player, capture or pillage Constantinople
Hold more than 30 tradeposts
Hold a region in each of the game theater
Capture a region without any losses
Lose all units (at least 20) when attacking a region and not capturing it
Hold 20 successive rounds as defender of a region
Hold of all England and Normandy
Hold of all Byzantine regions
Hold of all Spanish Peninsula regions
As the Danish player, conquer all of the former Carolingian Empire
As the Norwegian player, conquer all islands of the Atlantic (except England) and America
As the player, conquer all the other Viking players
Hold at the same time all islands in the Mediterranean
Hold at the same time all regions adjacent to the Mediterranean
Hold at the same time
Conquer Rome
As any player, control all the desert regions
As any player, lose all territories but Iceland
Hold of all North Africa and Middle-East lands
As the Norwegian player, keep Norge and never attack another Viking
As the Swedish player, conquer all of North and South Russia
Hold at the same time Scotland, Ireland and Dublin
Discover Greenland
Discover America (Vinland Region)