Here is the full list of all 79 Westerado: Double Barreled achievements worth 1,000 gamerscore.
Kill 25 people.
Get shot by your brother.
Kill 100 people.
Kill 250 people.
Kill 5 lizards.
Shoot the sheriff.
Kill 10 buffalo.
Shoot 10 empty bottles.
Shoot your Uncle.
Get a hatshot.
Get 3 hatshots in a row.
Unlock all playable Characters.
Buy an outfit.
Beat the game without getting shot.
Beat the game with less than 20 kills.
Beat the game in less than an hour.
Beat the game as the Gunslinger.
Beat the game as the Brother.
Beat the game as the Sister.
Beat the game as the Indian.
Explore 50% of the map.
Explore 100% of the map.
Explore more than 100% of the map.
Explore all the things (more than 120% of the map.)
Gather all clues about the murderer
Have 100 gunversations.
Pull your weapon 50 times during gunversations.
Have 5 drinks.
Complete 5 wanted posters.
Put two thousand dollars in the bank.
Win 5 hands of poker.
Lose 5 rounds of poker.
Convince the Beefhead Buffalos to follow you.
Start a play session.
Unfold the secret of the animal statues.
Find the Movie Set.
Unlock all Weapons.
Unlock all hats at the Haberdasher.
Kill your co-starring rivals.
Your Dad was the Murderer.
You were the Murderer.
Your family wouldn't give up their land.
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!
Keep all buffalo alive during a Buffalo Drive.
Prevent any packages from being stolen during the Carriage Protection.
Keep Rancher Bob, Bell and Cobb alive during the Mansion Attack.
Get the trains running again.
Help the Indians takes back their land.
Complete the Oil Tycoon's quest line.
Make peace between Indians and Military.
Takeover the Oil Tycoon's Mansion with Rancher Bob.
He has such great personalities.
Help the Sheriff'regain his courage.
Sheriff's worse than when you met him.
Make hats with Tressabell.
Help the Sheriff win back Tressabell.
Help Rancher Bob Johnston win over Tressabell.
Get the Beefheads jobs as Deputies.
Help the Beefhead Bulls find employment.
The banditos are back to causing trouble.
Get the Miner's Hat.
It sh*ts money.
Help the ghost miner find his pickaxe.
Reunite the Lost Miner and his wife.
Maybe the Miner should stay lost.
Playing as the sister get the river in Santa Anna flowing again.
Bring the drunk husband home to his wife.
Free all of the Buffalo enslaved by the Ranchers.
Helped the Indians get past the Military Blockade.
Make the Sheriff help you 3 times.
Help the Ranchers make a franchise.
Help the Union prepare for battle.
Buy the Riverside Mansion.
Talk to Oilrig Manager at every drilling location.
Convince the Ticket Salesman that you're from the Transcontinental Express.
Make the graveyard safe to visit.