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