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