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