Here is the full list of all 129 HOARD achievements.
The base game contains 118 achievements, and there is 1 DLC pack containing 11 achievements.
Kill a princess using a bomb wagon
Kill a castle using a bomb wagon
Kill a wizard tower using a bomb wagon
Kill a thief using a bomb wagon
Kill two knights at once using a bomb wagon
Burn down 1000 trees!
Destroy a bell-tower
Destroy a bumper crop
Destroy 250 bumper crops
Multiplayer: complete a game with 10 different Steam users
Multiplayer: complete a co-op game on every level