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