Full list of all 49 Overlord II achievements worth 1,000 gamerscore. It takes around 35-40 hours to unlock all of the achievements on Xbox 360.
You have won one Dominate map
You have won one Pirate Plunder map
You have killed an opposing Overlord 20 times in ranked versus matches
You have killed Solarius
Your Minion Horde is fully upgraded
You've obtained all the Tower Objects in the game
You've collected 100% of all Dark Crystals
You have a 100% Destruction Tyranny rating
You have destroyed both Nordberg and Everlight
Ghost Fay is now your 'special' friend
Ghost Fay has become your Mistress
You have forged the Infernal helmet and armor
You have gathered 5000 Lifeforce orbs
You have destroyed one Town
You have forged 3 weapons
You've killed 15 or more enemies with a single Catapult boulder
You have achieved 50 kills through overcharging your Evil Presence Spell
You have a 100% Domination Tyranny rating
You have Enslaved both Nordberg and Everlight
Juno is now your 'special' friend
Dark Fay is now your 'special' friend
Kelda is now your 'special' friend
You and your Mistresses have found a way to get along splendidly
Dark Fay has become your Mistress
You have discovered and used all Minion Mounts in the game
You have built 100% of the Tower buildables
You have enslaved one Town
You've collected 50% of all Dark Crystals
You've rescued the Blue Minions
You have built 50% of the Tower buildables
You've horded 50,000 gold
You have killed 100 baby seals
Juno has become your Mistress
Through Domination or Destruction you are now the Tyrant of Everlight
You have forged the Elemental helmet and armor
You've obtained the Green Minions
You've killed 1000 Gnomes
You have gathered 1000 Lifeforce orbs
You have rescued all the Minion crew from the spider webs
Kelda has become your Mistress
Through Domination or Destruction you are now the Tyrant of Nordberg.
You have gathered 250 Lifeforce orbs
You have forged a weapon
You've found the Red Minions
You have achieved 50 melee kills
You have gathered 10 Lifeforce orbs
You've caused mayhem during the Prelude
Win ten Pirate Plunder maps
Win ten Dominate maps