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