Here is the full list of all 56 Eador. Masters of the Broken World achievements.
Encounter Beleth.
Conquer a shard after constructing all available buildings in the stronghold.
Conquer a shard after gathering at least one set of 4 or more items.
Conquer a shard after unveiling the entire map.
Forge an alliance with the dwarves.
Eador remembers.
Encounter Oinor.
Capture your first shard.
Conquer a shard without losing any battles involving the heroes.
Conquer a shard after exploring over 1000% of uncharted land across the provinces.
Begin your first siege.
Forge an alliance with the centaurs.
Slay a dragon.
Destroy the guards of a store in province.
Capture over 50% of provinces on a shard.
Construct all possible buildings in the stronghold.
Reach 20th hero level.
Reach 10th hero level.
Resurrect a slain hero.
Receive medal with a unit.
Explore a province to 100%.
Survive with a hero the annihilation of his army.
Conquer your first province.
Earn first hero level.
Win your first tactical battle.
Talk to Zarr in the Astral.
Encounter Doh-Gor.
Encounter Vianta.
Encounter Oumm.
Encounter Stenriya.
Encounter L'Anshar.
Encounter Dariol.
Encounter Ul-Dagan.
Encounter Erdu.
Encounter Dorikos.
Encounter Adrageron.
Encounter Ranadil.
Encounter the Nameless.
Encounter Magnus.
Finish the game with «Destroy all life» ending.
Construct magic school of fourth tier.
Capture a shard in less than 45 turns.
Lose a battle for the shard due to an uprising in your capital province.
Fight off an attack by another Master against your shard.
Lose the campaign to Chaos invasion.
Forge an alliance with the orcs.
Forge an alliance with the goblins.
Forge an alliance with the elves.
Forge an alliance with the lizardmen.
Forge an alliance with the halflings.
Summon over 50 skeletons or zombies in a battle for the shard.
Encounter Herskil.
Conquer a shard without losing any units serving in the heroes' armies.
Conquer a shard after winning 10 fights on the Arena.
Conquer a shard after looting 10 locations with dragon guards.
Conquer a shard after plundering over 1000 gold from the provinces.