Here is the full list of all 12 Warlords trophies - there are 7 bronze, 4 silver and 1 gold.
Destroy 50 wall segments using only fireballs
Destroy 50 troops using only your troops
Win 103 matches
Destroy 50 troops using only fireballs
Own all powerup pads in a 4 player game at the same time
Destroy 50 wall segments using only troops
Repair 50 wall segments back to full health
Complete the single player campaign
Obtain 50 powerups
Banish the Black Knight 50 times
Get the White Knight Shield 50 times
Win a game with no wall segments left