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