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
Complete a mission without taking any damage
1000 dismemberments
Kill 100 enemies by boulder throw
Impale 100 enemies
500 grapple kills
Send Graven into the Netherworld in the Ocean Ruins and complete the game
Complete the game on Hard mode
Find all treasure chests
Combo Counter reaches 325
Kill 10 or more enemies simultaneously
Kill 5 or more enemies simultaneously
Combo Counter reaches 100
Activate all rune triumvirates
Find all Song of Death meter powerups
Save all maidens
Find 50 treasure chests
Find all Power Meter powerups
All two-handed blade attacks mastered
All dual wield attacks mastered
500 dismemberments
Defeat the Bone Cleaver in Argos and obtain The Ward of the Departed
Find all Health Meter powerups
All one-handed blade attacks mastered
Defend the ship and defeat the Giant Squid
Score 100000 total points
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
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
200 parry kills
Defeat the Sand Dragon in the lost city of Shem and obtain The Ward of the Earth
Collect all armor pieces
Defeat the Bone Cleaver and his army in Barachan Isles and obtain The Ward of Fire
Score 20000 points in a level
100 dismemberments
50 Grapple Kills
100 parry kills
Disarm 100 enemies
Disarm an enemy
Perform every parry kill move
Find 5 treasure chests
5 Grapple Kills
Impale an enemy
Kill an enemy by death fall
Save a Maiden