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