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