Here is the full list of all 54 Fallen Enchantress: Legendary Heroes achievements.
Win as Pariden.
Win as Capitar.
Win by forging an alliance with all players.
Win as Tarth.
Win as Resoln.
Win by casting the Spell of Making.
Recruit Nen Ratcatcher
Create a custom sovereign.
Win as Altar.
Play for 40 hours.
Win as Yithril.
You've managed to slay Vetrar!
Recruit Raza the Wild
Win by defeating all of your opponents.
Win as Kraxis.
Defeat a faction.
Make 1000 gildar from selling items in shops.
Play for 20 hours.
Recruit Gallowman
Recruit Mausolos
Win by completing the Master Quest.
Win and have at least 3,000 population.
Win as Gilden.
Get a city to level 5 in one game.
Play for 10 hours.
Design a unit.
Reach level 15 with a champion.
Complete 10 quests in a single game.
Tap 10 resources in a single game.
You've managed to slay Torax!
Control 5 cities in a single game.
You have captured an enemy city!
Recruit Tuatha
Recruit Ascian
Not since Peter MacNicol has one been slain!
Play for 5 hours.
Reach level 5 with a champion.
Explore 10 goodie huts in a single game.
You defeated a sovereign in battle!
Buy an item from a shop.
You have defeated an army!
You killed a monster!
Your Fame has lead a hero to your cause.
Complete a quest.
All nations start with one.
You've managed to slay Abeix!
You've managed to slay Delin!
You've managed to slay Morian!
Awarded for completion of the Legendary Hero scenario.
Win by having the highest score by the turn limit.
Win as Magnar.
Play for 100 hours.
Recruit Kasst
Win as Umber.