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.
Kill 10 players with your hand axe.
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.
Execute a prisoner in Dark Forest.
Destroy the developer gravestones in Death Valley.
Headshot, Decap or Head Explodie the last person to kill you after dying.
Kill 5 enemies without dying
Get a Headshot with the Ballista
Get 50 kills with the Longbow
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
Torch 5 players to death in one round
Slay 25 with throwing axes.
Slay 25 with throwing knives.
Accumulate 1000 Kills.
Kill 100 with your Warhammer.
Found the secret room!
Slay 1000 Agathians and 1000 Masons
Decapitate an opponent that is on fire
Decpitate 2 opponents with 1 swing
Get 500 kills with each class
Score 150 points or more on Sorrow
Kill 3 people while on the brink of death
Hit an opponent with a Javelin from over 100 feet away