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