Here is the full list of all 14 Castle Battles achievements.
Beat Les Moustachiers Campaign
Beat The Clearly Evil Empire Campaign
Beat The Purperilous Campaign
Beat The Order Of Awesome Campaign
Beat Les Moustachiers Campaign On Extreme Speed Mode!
Beat The Clearly Evil Empire Campaign On Extreme Speed Mode!
Beat The Purperilous Campaign On Extreme Speed Mode!
Beat The Order Of Awesome Campaign On Extreme Speed Mode!
Start Les Moustachiers Campaign
Start The Clearly Evil Empire Campaign
Start The Purperilous Campaign
Start The Order Of Awesome Campaign
.....