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