Here is the full list of all 14 Small Kingdoms Prologue achievements.
Fight an army vs army battle
Conquer the campaign world
Raze an enemy city
Loot an enemy city
Capture an enemy city
Fight a ship vs ship battle
Fight a siege battle
Play a game as the Kingdom of Karaman
Open the Options window
Open the Help window
Play a campaign as the Kingdom of Nogara
Start the game
Play a game as the Kingdom of Adagra
Play a game as the Kingdom of Oleria