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