Here is the full list of all 27 A Bloody Night achievements.
Complete the game
Kill 100000 enemies
Kill 10000 enemies
Destroy 20 explosive barrels
Get hit 20 times by lances
Destroy 40 barrels
Destroy 4 different towers
Destroy 20 walls
Kill the gold lancer
Kill an enemy with the pendulum
Cut the big tree
Free the beast
Block 10 arrows
Kill a blue soldier
Destroy 100 shields
Cut 20 boulders
Block a boulder
Cut 20 rocks
Kill 1000 enemies
Unlock the white armor
Destroy 20 columns
Get hit by a cannon ball
Kill 100 enemies
Kill a green soldier
Kill 10 enemies
Get hit by a log
Kill an enemy