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