Here is the full list of all 79 Westerado: Double Barreled achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Keep all buffalo alive during a Buffalo Drive.
He has such great personalities
Beat the game as the Sister
Beat the game in less than an hour
Mrs. Tressabell Johnston
The sheriff helped you 3 times
Sheriff's back to kicking Ass
Keep Rancher Bob, Bell and Cobb alive during the Mansion Attack.
He had it coming to him.
From mayhem to meats, the Beefheads did it all
It speaks louder than words.
He shot you? That's not what is supposed to happen.
Beat the game as the Indian
They read it, you weep.
Can't read my...
You just can't keep your hands off the stuff.
Come on now, what did those lizards ever do to you?
Find the Movie Set
Mrs. Tressabell Gunslinger
A place to start over.
Two thousand dollars in the bank. It's a lot of money. Takes me three years to earn it!
Buffalo wearing hats and stripes.
Convince the Ticket Salesman that you're from the Transcontinental Express.
Unlock all hats at the Haberdasher.
That buffalo wasn't even wearing the right hat.
A side of justice with your revenge?
This again? We know we just gave you a gun, but you might not want to shoot everyone.
You pretty much shot more people than actually exist, congratulations!
Unlock all playable Characters
Retake our land!
Now where is that deputy?
Dispatching justice will require style!
Sister got the river in Santa Anna flowing again.
Help the Indians get past the Military Blockade.
You know exactly what's on his person.
Beat the game as the Gunslinger.
Your family wouldn't give up their land.
Don't go thinking you're Annie Oakley, those three hatshots in a row were just a fluke.
Explore all the things
Rancher Franchise Made.
Lost Miner reunited with Miner's Wife.
Explore more
Explore 100% of the map
Trains back in town
Free all of the Buffalo enslaved by the Ranchers.
Prevent any packages from being stolen during the Carriage Protection.
Obviously you had to shoot all those people, they were coming right for you!
Digging beyond the veil.
Explore 50% of the map
Finally got that Miner's Hat.
So you had to shoot a few people, right? No big deal.
Sadly we have no knives, so you won't be running any faster.
Make the graveyard safe to visit.
Bla, bla, bla. You just keep jabbering on.
Where do you think you're going?
Soberly together again.
Onwards, adventure awaits!
Beat the game without getting shot
Beat the game with less then 20 kills
Beat the game as the Brother
Magnificent might be a bit of stretch, but the Seven part is undeniable.
Unfold the secret of the animal statues.
Unlock all Weapons
You just became the biggest star here, since there isn't anyone left except for a few extras.
Your Dad was the Murderer.
You were the Murderer.
Too much PDA, bro.
Your mother loved an Indian, and was hiding them in the walls.
They were all in on it!
You found all the endings!
Like playing monopoly
Peace between Indians and Military
Sheriff's worse than when you met him
Mrs. Tressabell Sheriff
The Beefheads playing for the other side
The banditos are back to causing trouble.
It sh*ts money
Lost Miner and Miner's Wife both move on.
Talk to Oilrig Manager at every drilling location.