Here is the full list of all 79 Westerado: Double Barreled achievements worth 1,000 gamerscore.
Too much PDA, bro.
You found all the endings!
You were the Murderer.
Beat the game as the Indian.
Beat the game as the Sister.
Beat the game with less than 20 kills.
They were all in on it!
Your Dad was the Murderer.
Sister got the river in Santa Anna flowing again.
Your mother loved an Indian, and was hiding them in the walls.
Mrs. Tressabell Johnston.
Beat the game in less than an hour.
He has such great personalities.
Sheriff's worse than when you met him.
Like playing monopoly. (Completed the Oil Tycoon's quest line.)
Talked to Oilrig Manager at every drilling location.
Mrs. Tressabell Gunslinger.
Kept all buffalo alive during a Buffalo Drive.
Unlocked all Weapons.
Kept Rancher Bob, Bell and Cobb alive during the Mansion Attack.
Mrs. Tressabell Sheriff.
Prevented any packages from being stolen during the Carriage Protection.
The sheriff helped you 3 times.
Sheriff's back to kicking Ass. (Helped the Sheriff gain his courage.)
Lost Miner reunited with Miner's Wife.
Unlocked all hats at the Haberdasher.
Convinced the Ticket Salesman that you're from the Transcontinental Express.
The Beefheads playing for the other side.
Magnificent might be a bit of stretch, but the Seven part is undeniable. (Befriended the Beefheads.)
Unlocked all playable Characters.
Retake our land! (Help the Indians takes back their land.)
Helped the Indians get past the Military Blockade.
He shot you? That's not what is supposed to happen. (Got shot by your brother.)
This again? We know we just gave you a gun, but you might not want to shoot everyone. (Shot Uncle.)
Now where is that deputy?
A place to start over.
It sh*ts money.
The banditos are back to causing trouble.
Found the Movie Set.
Discovered the secret of the animal statues.
Digging beyond the veil.
A side of justice with your revenge? (Completed 5 wanted posters.)
It speaks louder than words. (Pulled your weapon 50 times during gunversations.)
Come on now, what did those lizards ever do to you? (Killed 5 lizards.)
Dispatching justice will require style! (Bought an outfit.)
Two thousand dollars in the bank. It's a lot of money. Takes me three years to earn it!
That buffalo wasn't even wearing the right hat. (Killed 10 buffalo.)
Lost Miner and Miner's Wife both move on.
Made peace between Indians and Military.
Explored all the things (more than 120% of the map.)
Freed all of the Buffalo enslaved by the Ranchers.
Beat the game as the Gunslinger.
Your family wouldn't give up their land.
You pretty much shot more people than actually exist, congratulations! (Killed 250 people.)
Explored more than 100% of the map.
Explored 100% of the map.
Obviously you had to shoot all those people, they were coming right for you! (Killed 100 people.)
You just can't keep your hands off the stuff. (Had 5 drinks.)
Where do you think you're going? (Shot 10 empty bottles.)
Trains back in town. (Got the trains running again.)
You know exactly what's on his person. (Gathered all clues about the murderer.)
He had it coming to him. (Captured the Oil Tycoon's Mansion with Rancher Bob.)
Can't read my.. (Won 5 hands of poker.)
Rancher Franchise Made.
From mayhem to meats, the Beefheads did it all.
Buffalo wearing hats and stripes. (Helped the Union prepare for battle.)
So you had to shoot a few people, right? No big deal. (Killed 25 people.)
Finally got that Miner's Hat.
Explored 50% of the map.
Don't go thinking you're Annie Oakley, those three hatshots in a row were just a fluke.
They read it, you weep. (Lost 5 rounds of poker.)
Made the graveyard safe to visit.
Sadly we have no knives, so you won't be running any faster. (Got a hatshot.)
Soberly together again.
Bla, bla, bla. You just keep jabbering on. (Had 100 gunversations.)
Onwards, adventure awaits!
Beat the game without getting shot.
Beat the game as the Brother.
Kill your co-starring rivals.