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