The The Princess and The Pig Add-on for Stronghold Crusader 2 has 7 achievements.
Defeat a team of The Pig, The Rat and The Wolf in a skirmish match
Complete "Surrounded" within "The Princess & The Pig" skirmish trail without losing any hovels
Complete "The Princess & The Pig" skirmish trail
Kill 100 of The Princess' troops with your lord in a single skirmish game
Capture all the village estates in the "Conquerors" mission before any players are defeated
Defeat The Pig 1 vs 1 without destroying any of his walls in a skirmish match
Defeat The Princess and Richard in a single skirmish match