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