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