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