Here is the full list of all 41 Arslan: The Warriors of Legend achievements worth 1,000 gamerscore.
Acquired an S Rank for every Objective in all scenarios other than the Tutorials.
Defeated Kharlan using Zandeh.
Activated a Mardān Rush with all characters.
Defeated Hilmes using Alfarīd.
Cleared a scenario in Online Mode or cooperative play.
Cleared all scenarios.
Activated Mardān Rush a total of 200 times.
Activated 500 Chain Strikes.
Collected all Recipe Books.
Reached the maximum level with a character for the first time.
Cleared an Extra Scenario for the first time.
Cleared any scenario other than a Tutorial on "Extreme" difficulty.
Achieved a total of 10000 KOs using Mardān Rush.
Obtained a Limited Skill Card for the first time.
Ate some cooking for the first time.
Unlocked all playable characters.
Cleared Story Mode.
Sold a Skill Card for the first time.
Achieved maximum Mastery with a weapon for the first time.
Defeated Bahadur in the Duel Before the Gods.
Achieved 50000 CHAIN hits during a Mardān Rush.
Cleared any scenario other than a Tutorial in 2 minutes or less.
Attacked using Azrael.
Regrouped with your companions in Peshawar.
Discovered a secret route.
Cleared any scenario other than a Tutorial without taking any damage.
Defeated Kharlan.
Synthesized a Skill Card for the first time.
Acquired all other Achievements.
Achieved 500 CHAIN hits.
Cleared the Battle of Atropatene.
Achieved a total of 1000 KOs using mounted attacks.
Achieved 1000 KOs in any scenario.
Achieved an overall S Rank for the first time.
Activated a Unique Skill.
Activated a Special Move.
Activated a Chain Strike.
Cleared a scenario for the first time.
Activated a Mardān Rush.
Achieve maximum Mastery for all weapons.
Acquire all Limited Skill Cards.