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