Call of Juarez Gunslinger

During a scripted fall or jump-down, trigger Concentration (slow-mo) and tag five enemies before you land. There's a well-known early drop into a grouped set of enemies that works nicely; farmable via chapter replay if you miss it.

Buy every skill across all three trees with Story-mode XP. It's a lot of XP - roughly a full playthrough plus some grinding; replay chapters or Arcade to bank enough if you're short.

Shielder enemies carry a wooden shield with a hole near the top and peer through it as they advance. From a distance, aim at that hole and land a headshot through it. Easiest at the lumber yard in the 4th mission, which has three Shielders to practise on.

Equip a shotgun, get point-blank on an enemy who is himself carrying a shotgun, and kill him with the blast. Shotgunners are common in the mid-game missions.

Finish the story on Hard. Chapter-select is available, so you can do the difficulty runs piecemeal rather than in one sitting.

In Duel Mode, win every duel with the "honourable" stamp - keep your reticle off the opponent's body and only draw/aim once he actually reaches for his gun, then fire. Do it for all the duels in the challenge.

At the end of the final mission (The Good, the Bad, and the Dead), when given the choice against Roscoe "Bob" Bryant, choose Redemption (forgive) rather than Revenge. Mutually exclusive with Violence Begets Violence on the single choice, but replay the final chapter and pick the other to get both.

Spend XP to buy your first skill in any tree. Unlocks naturally very early on.

Finish the story on True West, the hardest setting. Chapter-select replayable, and clearing True West also credits the lower difficulty tiers.

Earn all 30 Arcade stars - three stars on each of the 10 missions. Needs high-scoring, combo-heavy runs on every one.

Hit the top score threshold on a single Arcade mission with a sustained combo multiplier. A subset of the all-stars grind (Legend Among Legends).

Each skill tree has two exclusive weapons deep in it. Pour all your XP into a single tree and buy far enough to unlock both of that tree's exclusive weapons.

Cumulative - spend a total of 15 minutes with Concentration (slow-mo) active across any modes. Comes naturally over a full playthrough; grind it in combat-heavy chapters if you're short.

Story. In "Without Forgiveness", at the end of the big cave/mine shootout you duel Jim Reed - win it to unlock. It comes just from completing that chapter.

Story. Reach the derelict steamer at the end of "Bounty Hunter Is Still My Name" - it's awarded on discovering the wreck, so it can't be missed on that chapter.

In a duel, build your Speed/focus meter high with your hand steady and off the opponent's body, then draw and fire the instant he reaches for his gun - landing the honourable kill in under 0.6 seconds. Practise on an early Duel-mode opponent.

Finish all story missions on any difficulty - unlocks on your first full completion.

Story. In "Gunfight at the Sawmill", after beating Curly Bill you duel Johnny Ringo - win it to unlock. Comes from completing the chapter.

Play each of the 10 Arcade missions to completion - any score, star quality doesn't matter for this one.

Story. In "Once Upon a Time in Stinking Springs", this unlocks as the chapter's Pat Garrett duel sequence resolves - it can't be missed on that chapter.

During a duel, birds circle the arena - shoot one out of the air and still win the duel (do it during the draw or right after landing the kill so you don't lose). Easiest attempted in Duel Mode.

Collect every Nugget of Truth within a single mission. Use a Nugget-location guide; missable within a run, but any mission is replayable. A stepping stone to Unvarnished Truth.

Chain 20 kills without the combo timer running out. Easiest during the Gatling Gun section in "Bounty Hunter Is Still My Name", where dense enemy waves let you rack it up fast.

When a dynamite-thrower lobs a stick, trigger Concentration (slow-mo) and, in that one activation, shoot both the airborne dynamite and the thrower. Best attempted in "The Magnificent One", which features dynamite throwers.

At the final mission's climax, choose Revenge against Roscoe "Bob" Bryant, then win the resulting duel with the honourable stamp. Mutually exclusive with Into the Sunset on the choice; replay the final chapter to grab both.