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