Here is the full list of all 37 Ancestors Legacy achievements worth 1,000 gamerscore.
Completed all the campaigns of the Vikings, Anglo-Saxons, Germans and Slavs
Completed Boleslav I the Brave's campaign
Destroyed all the enemy ships in the mission 'Fearsome Mercenaries'
Discovered what happened to the villagers at the 'Battle Of The River Bug'
Completed Mieszko I's campaign
Captured the village of Kopyto in mission 'The Battle Of Cedynia'
Sneaked into the enemy base undetected in the mission 'Siege Of Niemcza'
Finished the 'Battle of Lidzbark' in less than 25 minutes
Completed the Teutonic Order campaign
Disarmed all the traps without being detected in the mission 'The Night Hunters'
Captured all the villages in the mission 'Battle Of Christburg'
Defended Lubawa using only ranged units in the mission 'Battle Of Lubawa'
Killed every bandit and saved all the villagers in 'The Knights Of The Cross'
Completed Rudolf I's campaign
Killed 2000 peasants
Picked up all the armors in the mission 'The Siege Of Vienna'
Defeated each type of unit in the game at least once
Completed Harold II Godwinson's campaign
Killed Harald Hardrada in less than 5 minutes in 'Before They Find Out'
Completed Edward the Confessor's campaign
Delivered 5+ catapults before the night-time in the mission 'Wells Under Siege'
Completed Rurik's campaign
Captured and held all the villages in the mission 'Battle on Two Fronts'
Recruited each type of unit in the game at least once
Completed Ulf Ironbeard's campaing
Won a Multiplayer match or Skirmish in less than 8 minutes
Won a match against an AI on Insane difficulty
Destroyed a village with a Gold defense
Replenished a squad ten times
Helped at least 8 drakkars survive in the mission 'The Last Impediment'
Sent peasants to work at a resource point 50 times
Unlocked veterancy on any unit ten times
Specialized ten squads
Detected and destroyed five enemy traps
Defeated an entire enemy squad with only ranged attacks
Completed the mission 'Off The Course'
Started a match in Multiplayer or Skirmish against any opponent