Here is the full list of all 62 Ancestors Legacy achievements.
Start a match in Multiplayer or against AI
Complete Ulf Ironbeard's campaign
Destroy any building with a siege machine
Send peasants to work at a resource point 50 times
Reach maximum level with any squad
Complete the base building training mission
Raise the alarm in your village
Raise the defense level of your village
Complete the economy training mission
Raise a squad's armor to its maximum level
Specialize ten squads
Replenish a squad ten times
Complete the squad training mission
Make an enemy trigger a trap you built
Defeat an entire enemy squad with ranged attacks only
Complete the basic training mission
Complete Rurik's campaign
Complete Edward's campaign
Complete Harold's campaign
Complete Rudolf's campaign
Complete Mieszko's campaign
Win a match in Multiplayer or against AI
Lose a match in Multiplayer or against AI
Win a Multiplayer match or AI Skirmish in less than 8 minutes.
Win a match against an AI on Insane difficulty
Unlock a veterancy ten times
Destroy a village with Gold defense
Defeat each type of unit in the game at least once
Recruit each type of unit in the game at least once
Detect and destroy five enemy traps
Help at least 8 drakkars survive the siege before Lindisfarne
Capture and hold all villages at Izborsk
Deliver 5 or more catapults before night-time at Wells
Kill Harald in less than 5 minutes at Stamford Bridge
Pick up all armors scattered behind Vienna's walls
Capture the village of Kopytko
Kill 2000 peasants
Sneak into the enemy base undetected
Don't let any of the enemy convoys pass through the outpost
Find out what happened to the villagers
Destroy all enemy ships
Don't let the enemy attack any of the catapults from your team
Complete Boleslav's campaign
Get rid of all the bandits and save all the villagers in Pokarvis
Defend Lubawa only using ranged units
Capture all the villages near Christburg
Disarm all the traps without being detected in Natangia forest
Finish the Battle of Lidzbark in less than 25 minutes
Complete Konrad's campaign
Start Konrad's campaign
Don't lose any squads in the mission 'Battle of The Horns of Hattin'
Complete all the quests with only one Hassassins squad in Akka
Claim all the wells in the mission 'Impatient Vengeance'
Claim all the villages and expand your base in 30 minutes in 'The Final Straw'
Kill all the Christian preachers in the mission, 'Siege of Jerusalem'
Complete Salah ad-Din Yusuf's campaign
Start Salah ad-Din Yusuf's campaign
Kill an enemy hero in a Multiplayer or Skirmish match with a Hassassin squad
Kill 5 enemy squads in 1 minute only using Grenadiers
Win a match on Desert and Wilderness, Crusade of Anarchy or Scorching Quarrel
Win a match as the Saracens in Anihilation Mode
Destroy the enemy's Town Hall using Scorpions