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