Here is the full list of all 49 Conan achievements worth 1,000 gamerscore. It takes around 20-25 hours to unlock all of the achievements on Xbox 360.
Complete the game on King mode
Combo Counter reaches 325
Complete the game on Hard mode
Send Graven into the Netherworld in the Ocean Ruins and complete the game
Kill 10 or more enemies simultaneously
All one-handed blade attacks mastered
Combo Counter reaches 100
Find all treasure chests
Activate all rune triumvirates
Find all Song of Death meter powerups
Save all maidens
Find all Power Meter powerups
All two-handed blade attacks mastered
Find 50 treasure chests
Collect all armor pieces
Defeat the Bone Cleaver in Argos and obtain The Ward of the Departed
1000 dismemberments
Disarm 100 enemies
Kill 100 enemies by boulder throw
200 parry kills
All dual wield attacks mastered
500 dismemberments
Find all Health Meter powerups
100 parry kills
Score 100000 total points
Defend the ship and defeat the Giant Squid
500 grapple kills
250 grapple kills
Kill 100 enemies by death fall
Kill at least 25 enemies during the Giant Squid boss battle
Defeat the Sorceress Queen in Stygia and obtain The Ward of Souls
Kill 5 or more enemies simultaneously
Decapitate a captain with a shield
Defeat the Elephant Demon in the Kush caves and obtain The Ward of the Abyss
Activate 5 rune triumvirates
Score 20000 points in a level
100 dismemberments
Impale 100 enemies
Perform every parry kill move
Complete a mission without taking any damage
Defeat the Sand Dragon in the lost city of Shem and obtain The Ward of the Earth
50 Grapple Kills
Disarm an enemy
Defeat the Bone Cleaver and his army in Barachan Isles and obtain The Ward of Fire
5 Grapple Kills
Kill an enemy by death fall
Impale an enemy
Find 5 treasure chests
Save a Maiden