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