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