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