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.
Fire the Trebuchet in The Siege.
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
Push the cart on Dark Forest.
Push the bomb cart in Helms Deep.
Kill 100 with your Warhammer.
Get 200 Kills with the Longbow
Torch 5 players to death in one round
Decapitate a peasant in The Shore.
Slay 25 with throwing axes.
Accumulate 1000 Kills.
Kill 10 players with your hand axe.
Decapitate an opponent that is on fire
Get 50 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 knives.
Found the secret room!
Chop down the Tree in The Shore.
Execute a prisoner in Dark Forest.
Destroy the developer gravestones in Death Valley.
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