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