Here is the full list of all 33 Age of Chivalry achievements.
Be mean to animals.
Get the first kill in a round
Kill someone with an oilpot.
Push the cart on Dark Forest.
Chop down the Tree in The Shore.
Decapitate a peasant in The Shore.
Fire the Trebuchet in The Siege.
Push the bomb cart in Helms Deep.
Destroy the developer gravestones in Death Valley.
Decapitate an opponent that is on fire
Decpitate 2 opponents with 1 swing
Headshot, Decap or Head Explodie the last person to kill you after dying.
Kill 3 people while on the brink of death
Kill 5 enemies without dying
Execute a prisoner in Dark Forest.
Get 50 kills with the Longbow
Accumulate 1000 Kills.
Kill 100 with your Warhammer.
Torch 5 players to death in one round
Get 200 Kills with the Longbow
Get 1000 kills with the Longbow
Get 200 kills with the Dagger
Get 10 Headshots with the Bow in one game
Get 20 decapitations in one round
Slay 25 with throwing axes.
Slay 25 with throwing knives.
Kill 10 players with your hand axe.
Found the secret room!
Slay 1000 Agathians and 1000 Masons
Get 500 kills with each class
Score 150 points or more on Sorrow
Get a Headshot with the Ballista
Hit an opponent with a Javelin from over 100 feet away