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