Here is the full list of all 99 Mist Legacy achievements.
Enter Giltanbourg.
Activate Corinna's portal.
Pass the door of justice towards Gantras.
Activate the Enorwen portal.
Evolve Ovie.
Reach the Fort of the Mistwalkers.
Defeat Valdiss.
Build a first herbatum.
Activate the Prettybard portal.
Be recognized in Kortombe.
Investigate your first ruin with the druids.
Activate the Wellnear portal.
Become acolyte of the Circle of the Great Tree.
Become a wanderer of the Lunar Caravan.
Complete Sorka's quests.
Activate the Whisper Portal.
Save Ouab and become a herbalist.
Be accepted at Fearpiercing Camp.
Learn the basics of magic with Yolasula.
Recruit Finn Vorel.
Build a first shelter.
Build a first barracks.
Defeat Zhyxhu.
Build an outdoor workshop.
Complete the Militia Introductory Quests.
Build your first cart.
Defeat the Aquagremfyr.
Build a first paddock.
Learn to peer into the Mists.
Recruit Corrin Fortvaillant.
Help all of the scribe's friends.
Recruit Ovie.
Complete the tower construction quests.
Activate the Kortombe portal.
Complete the introduction on the Troll Plateau.
Activate the Troll portal and come back to your domain.
Recruit Badouk Brank.
Recruit Palenne Roirdan.
Defeat Tortolus.
Defeat Rayth.
Defeat Arriel and Ela.
Defeat Hoboturla.
Activate Thorval Portal.
Activate the Gantras portal.
Activate the Leviathan portal.
Activate the Chimeric portal.
Activate the Norkantas portal.
Activate the Grandfall portal.
Complete the quests related to the Scabonzis.
Complete the collector Innkeeper quests.
Be invited in Wellnear.
Be familiar in Larcen.
Be recognized in Gantras.
Be seefeets in Thorval.
Defeat Ilmagoth.
Defeat Bobu.
Defeat the Scabonzi guardian protector.
Defeat the Great Protector.
Defeat Gularzob.
Build a first workshop.
Build a first dispensary.
Build a first forge.
Build a first cutting plant.
Build a first sawmill.
Build a first tannery.
Build a first studio.
Defeat Serassert.
Complete the Alchemy Learning Quests.
Integrate the guilds of Ordval for Leonidas.
Complete the Lithofortress.
Become an apprentice Arcanist.
Become a claw in the Assembly.
Become a Messenger of the Order of the Hippogriff.
Become squire of the Protector of the Rose.
Defeat Whuzulm.
Become Mistwalker
Defeat heroic Whulzum.
Defeat heroic Gularzub.
Defeat the Cybelfly Queen
Evolve Finn.
Defeat Hilla
Defeat Hazko.
Buy the flame frame.
Build a first warehouse.
Defeat heroic Hazko.
Defeat Rylenback.
Defeat the Tarascarpel.
Defeat heroic Rylenback.
Defeat Eli'carde.
Defeat Tarathiel.
Defeat heroic Tarathiel
Defeat the army of darkness.
Defeat Cyclotus.
Complete the adventures on the island of Tinylegs
Defeat Ezhilya.
Defeat Mo'gul.
Defeat Walkrock.
Defeat heroic Ezhilya.