Here is the full list of all 64 King Arthur's Gold achievements.
Get launched from a catapult 20 times
Launch another player from a catapult 20 times
Get 500 kills
Return your team's flag 20 times
Get 50 stomp kills
Man them!
Ride your tamed bison
Use all animals in game
Take 10 halls
Get killed with a pickaxe 20 times
Cap 20 flags
Make love, not war
Complete 10 Challenge mode maps
Kill the Princess
Return your team's flag 5 times
Test the air-speed velocity of a laden chicken
Catapult a shark
Kill the enemy flag carrier 10 times
Ride in every vehicle
Kill a player with a boulder 5 times
Cap 5 flags
Get a kill while on fire
Take a nap in a quarters
Steal an enemy's mine
Kill an enemy with a tamed shark
Run over an enemy with a vehicle
Reach 500 coins at a time
Get killed with an arrow 20 times
Get a kill by launching a boulder from a catapult
Get a bomb kill as an archer or builder
Buy something at an enemy shop
Heal an ally with a burger
Carry 4 burgers in your backpack at a time
Get a kill with each class in the same round
Kill someone using a fire arrow
Carry all 4 kinds of arrows
Commit suicide
Blow yourself up as well as the enemy using a bomb
Get 5 kills with the drill
Use water arrows 20 times
Use fire ammo 20 times
Join a modded server
Eat a flower
Remain the last player alive in a TDM match
Win 10 matches
Kill whole enemy team in TDM (at least 3 players)
Use chat
Get 50 kills
Design and arrange a shrub
Switch teams
Win a match
Sushi!
Get killed with a sword 20 times
Defuse a mine
Get a kill on an enemy while dead
Join multiplayer
Save the Princess
Get 5000 kills
Kill 3 people with 1 bomb
Kill 5 enemies with 1 keg
Win 100 matches
Take 40 halls
Go down with a sinking warboat
Capture 5 warboats