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