Full list of all 54 Overlord achievements worth 1,250 gamerscore. It takes around 40-50 hours to unlock all of the achievements in the base game on Xbox 360.
The base game contains 44 achievements worth 1,000 Gamerscore, and there are 2 DLC packs containing 10 achievements worth 250 Gamerscore.
All achievements
Achievements they've won
Achievements they've not won
Defeat the 7th Hero
Win with the clearest conscience
Forge an Ultimately Imbued Arcanium Set
Harvest a massive amount of Lifeforce
Forge an Ultimately Imbued Durium Set
Forge an Ultimately Imbued Steel Set
Steal a Hero
Defeat all the Dungeon Creatures
Get angry with a Hero
End a Hero's obsession
Retrieve the most Powerful Smelter
Forge a full Arcanium set
Defeat half the Dungeon Creatures
Fulfill your Mistress's wishes
Cure a Hero of life
Retrieve a powerful Smelter
Forge a full Durium set
Harvest a huge amount of Lifeforce
Put a Hero to sleep. Permanently.
Retrieve the Blue Hive
Retrieve the Green Hive
Retrieve a Smelter
Get yourself a little company and some help spending your money
Puncture a Hero
Retrieve the Red Hive
Harvest lots of Lifeforce
Retrieve the Food, but will you keep or return it?
Retrieve a Crane to start rebuilding the Tower
Harvest Lifeforce
Retrieve the Tower Heart to power up the Tower
Win with the blackest heart
Collect all the Tower Objects
Get a full Horde, fully equipped
Last for 5 minutes in Survival
Last for 15 minutes in Survival
Last for 30 minutes in Survival
Complete a ranked Pillage match
Win a ranked Pillage match
Win 10 ranked Pillage matches
Win 50 ranked Pillage matches
Complete a ranked Slaughter match
Win a ranked Slaughter match
Win 10 ranked Slaughter matches
Win 50 ranked Slaughter matches
Defeat the 7th Hero in Legendary Mode
Last for 45 mins in a Expansion Survival Map
Win 25 ranked Expansion Pillage Maps
Win 25 ranked Expansion Slaughter matches
Defeat all the Expansion Dungeon Creatures
Conquer the Mellow Hills Abyss
Conquer the Evernight Forest Abyss
Conquer the Heavens Peak Abyss
Conquer the Golden Halls Abyss
Conquer the Ruborian Desert Abyss