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