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