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