Here is the full list of all 39 Siege of Avalon: Anthology achievements.
Find Captain Avarous and report for training.
Find missing love letter.
Fetch Brother Mo some herbs from the ruined village.
Find out what has infested the grain supplies in the basement and kill it.
Discover what has happened to Corvus.
Fetch Freemen a bar of steel from the ruined village.
Solve Pell's problem.
Find a locked chest in the village and report on its status.
Fetch Elarath an amulet from the village.
Fetch Friar Massus a chalice from the temple in the village.
Find the Earthstone and bring it back to Roth.
Retrieve a letter proving the identity of a traitor.
Find out who poisoned King Isdernus and acquire a sample of the poison.
Bring Tracy his ring back.
Bring Weldon news about his replacement.
Discover what has happened to Tristan's friend.
Discover what has happened to Felious' friend.
Discover what has happened to the courier.
Free the Lurkers from their curse.
Free Lydia from the lichs control.
Ensure that a letter is delivered to Holden.
Collect four status reports for Sir Mabon.
Collect the bracelets from three Shadow Spirits.
Retrieve King Tortain's signet ring, crown, and armor.
Defeat three opponents to earn the right to learn three new combat skills.
Go back to Holden in the forest for one more fight.
Scout the enemy camp and report back to Mudam.
Retrieve a Dreamwalker's Wand for Olon.
Retrieve Ovoron's satchel.
Rescue Edgard from the Sha'ahoul camp.
Switch a staff with one in Mithras' tent.
Perform three stealthy tasks to earn the right to learn three new skills.
Destroy the battering ram.
Assassinate General Ovoron.
Finish Chapter 1
Finish Chapter 2
Finish Chapter 3
Finish Chapter 4
Finish Chapter 5