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