Here is the full list of all 14 Domain Defense achievements.
Taken Your First Step
Completed Spring Levels
Completed Cavern Levels
Completed Winter Levels
Completed Tower Limit Challenge
Completed Continuius Challenge
Completed Hard Challenge
Completed Four Player Split Screen
Completed All Single Player Achievements
Blocked The Path Of Enemies
Only Used Arrow Towers
Kill 100,000 Enemies
Complete 1,000 Rounds
Kill 100 Major Bosses