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