Here is the full list of all 24 Dark Lord: Peacemaker achievements.
Life in Exile.
History Repeats Itself.
A Dream Comes True.
Peace.
Mortals.
Start a new game on replay mode.
Finish your adventure as a human.
Finish your adventure as a dark elf.
Finish your adventure as an orc.
Defeat the Goblin.
Defeat the hero party on extreme mode.
Defeat the Prince party on extreme mode. (I)
Defeat the undead party on extreme mode.
Defeat the King party on extreme mode.
Defeat the Prince party on extreme mode. (II)
Defeat the Wind Elemental on extreme mode.
Defeat the Giant on extreme mode.
Defeat the final boss on extreme mode.
Gain a Hero Shield.
Gain a Hero Sword.
Gain a Hero Robe.
Gain 1 medal.
Gain 5 medals.
Gain 10 medals.