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