Here is the full list of all 26 Call of Juarez: Gunslinger achievements worth 400 gamerscore.
Complete the duel challenge, winning all duels honorably.
Kill a bird during a winning duel.
Get all Arcade Mode stars.
Complete all Arcade missions.
Score the maximum of 3 stars in any Arcade mission.
Complete the Story on True West difficulty.
Unlock all skills in Story Mode.
Win a duel honorably in under 0.6s.
Fight in Concentration for 15 minutes.
Forgive your lifetime nemesis.
Complete the Story on any difficulty.
Complete the Story on hard difficulty.
Kill your lifetime nemesis honorably in a duel.
Collect all Nuggets of Truth.
Reach combo level of 20.
Find and kill Jim Reed.
Discover a shipwreck in the Missouri swamps.
Shoot a flying stick of dynamite and the one who threw it on a single Concentration.
Kill a shotgunner with a close-range shotgun blast.
Unlock both exclusive weapons in a single category of skills in Story Mode.
Kill 5 enemies when falling down through the air.
Find and kill Johnny Ringo.
Shoot through a hole to kill an enemy that hides behind a shield.
Give it to them straight about your meeting with Pat Garrett.
Find all Nuggets of Truth in a single mission.
Unlock a skill.