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