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 10 Pirate Plunder maps
You have won one Pirate Plunder map
You have won ten Dominate maps
You have killed an opposing Overlord 20 times in ranked versus matches
You have won one Dominate map
You have forged 3 weapons
You have achieved 50 kills through overcharging your Evil Presence Spell
Juno has become your Mistress
Through Domination or Destruction you are now the Tyrant of Everlight
You've collected 50% of all Dark Crystals
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 killed 15 or more enemies with a single Catapult boulder
You've caused mayhem during the Prelude
Corrupt Queen Fay to turn her into Dark Fay
Kill Dark Fay to turn her into Ghost Fay
Buy gifts for Kelda and woo her into becoming your 'special' friend
Kill Solarius
Fully upgrade all 50 Minions in your Horde
Find the Blue Minions
Build 50% of the Tower buildables
Build 100% of the Tower buildables
Achieve a 100% Domination Tyranny rating
Achieve a 100% Destruction Tyranny rating
Obtain all the Tower Objects in the game
Collect 100% of all Dark Crystals
Collect 50,000 gold
Buy gifts for Juno and woo her into becoming your 'special' friend
Buy gifts for Dark Fay and woo her into becoming your 'special' friend
Buy gifts for Ghost Fay and woo her into becoming your 'special' friend
Forged the Elemental helmet and armor
Forge the Infernal helmet and armor
Gather 5000 Lifeforce orbs
Discover and use all Minion Mounts in the game
Destroy one Town
Destroy both Nordberg and Everlight
Enslave one Town
Enslave both Nordberg and Everlight
Find a way for you and your three Mistresses to become 'special' friends
Kill 100 baby seals