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