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