Here is the full list of all 38 MORDHAU achievements.
Decapitate 5 enemies in a single game
Kill two enemies with a single attack from a melee weapon
Lose your head three times in a single match
Get 30 kills in a single match
Deflect a projectile with a strike
Kill 10 enemies in a row without dying
Kill an enemy after dying
Complete the tutorial
Kill 30 enemies with fists
Finish off 10 enemies with a kick
Kill an enemy with an icicle
Kill 5 enemies with the bear trap
Kill 5 enemies with the mallet
Kill an enemy with the training sword
Kill an enemy with the pommel throw
Kill 20 enemies with the ballista
Kill 5 enemies with the lute
Kill 10 enemies with the carving knife
Kill 5 enemies with rocks
Kill 20 enemies with the longsword
Land 10 headshots on enemies with projectiles in a single game
Regenerate to full health after getting down to 1 health
Kill 10 enemies with fire
Kill 5 enemies with headshots with a couched weapon on horseback
Perform 20 disarms
Block 1000 melee attacks
Block 100 projectiles
Chamber 200 attacks
Take a melee weapon out of a living enemy’s body
Take 400 damage without dying
Battlecry 500 times
Kill 5 enemies while climbing a ladder
Get 30 assists in a single match
Kill 5 enemies by trampling them with the horse
Cause someone to fall to their death after kicking them
Kill an enemy while you are on fire
Kill 1000 enemies
Reach 1000 assists