Overlord II Cheats

Perfect Horde (Silver): Fully upgrade all 50 Minions in your Horde.
Pillager (Bronze): Win ten Pirate Plunder maps.
Red Rescuer (Bronze): Find the Red Minions.
Rescuer of Kelda (Bronze): Rescue Kelda from Nordberg.
Scrooge (Silver): Collect 50,000 gold.
Seal Slayer (Bronze): Kill 100 baby seals.
Slaver (Bronze): Enslave one Town.
Snatcher (Bronze): Win one Pirate Plunder map.
The Big D (Bronze): Win ten Dominate maps.
The Destructor (Silver): Achieve a 100% Destruction Tyranny rating.
The Dominator (Silver): Achieve a 100% Domination Tyranny rating.
Town Razer (Bronze): Destroy one Town.
Tyrant of Nordberg (Bronze): Complete full Tyranny over Nordberg through either Domination or Destruction.
Tyrant of the Tower (Silver): Build 100% of the Tower buildables.
Ultimate Collector (Silver): Collect 100% of all Dark Crystals.
Walking Apocalypse (Silver): Destroy both Nordberg and Everlight.
Weapons Nut (Bronze): Forge three weapons.

Gnome Means Gnome
Need to commit gnome genocide in a hurry? Finish reclaiming the green hive quest from Everlight Facility. Return there and use the gnome gates to increase the levels of your minions, get life force and treasure (gems), and complete this tedious quest.

Gold Mine For Your Three Gold Diggers
After defeating the spider boss in Everlight Temple you will get back out using the elevator. Once you have the Netherworld Gate to this zone unlocked, return and open the secret room at the top of the stairs (using the Overlord switch). The treasure chests inside this secret room will give you an average of 1000 or more gold each visit. You will need to warp to another gate to reset the map. Try Nordburg Town gate 3, as there are four or five treasure chests right next to the Tower Gate. Rapidly cycling these two maps should inflate your treasury with plenty of gold.

Dominating Perfection
When dominating towns completely, use the weapons produced by the enthralled villagers to increase the attack power of your horde to the maximum. If you have the maximum horde size of 50 minions and manage to hit the maximum attack power, you will earn the Perfect Horde trophy or achievement.

Ladies' Man Trophy
In order to get the Ladies' Man Trophy, you have to purchase two items for each lady -- one for the private chambers and the other in the throne room. You also have to have the Overlord Banner. For example:

For yourself: Overlord Banner
For Lady A: Bed + Throne
For Lady B: Curtains + Statues
For Lady C: Candles + Alcoves