Here is the full list of all 53 Weird West achievements.
Recruit a full posse
Kill your first monstrous enemy
Catch 2 or more enemies in Chain Lightning
Turn in your first bounty from the board
Recruit your first follower
Use a Golden Ace of Spades to gain a perk for the first time
Use a Nimp Relic to gain an ability for the first time
Dig up your Bounty Hunter cache and suit up
Save the world
End the world
Complete the Bounty Hunter Journey
Complete the Pigman Journey
Complete the Protector Journey
Complete the Werewolf Journey
Complete the Oneirist Journey
Take down Shelby Cross in Copper Mountain Quarry
Get your spouse out of the quarry without ever alerting Shelby Cross
Turn Ruth into a Pigwoman
Recruit a previous Journey Hero to your posse
Kill Maximo and free the Lantern room’s workers
Become a Wiindigo
Return Glenn Mills’s rifle to Maryann
Retrieve the fallen Sheriff’s star from the ruins of Boulder Creek mine
Read Sybil’s journal
Rescue the missing Werewolf
Kill 3 enemies in less than 5 seconds in Wolf form
Save both innocents in The Strangeness
Spare Essex Mast at the end of the Oneirist Journey
Bring all the Journey Heroes back to the Broken Steppe Temple alive
Complete a quest given by a Ghost
Complete 10 side quests
Aid Essex Mast on his quest
Beat Pigman Joe at a Poker Game
Return the Heathen’s Box unopened
Turn a Tornado into an Elemental Tornado
Beat the Heathen at her Slap Game
Turn a Bounty Hunter into a Werewolf
Knock someone out by dropping onto them from above
Turn one of your arrows into an elemental arrow
Collect all 3 of Pigman Joe’s Tour du Weird West souvenir snow globes
Start a fight against a bear while drunk… and win
Dig up 10 mound caches
Collect the bounty on a Pigman or Ravenous
Steal $10,000 worth of goods in a single playthrough
Serve time in jail
Locate every Temple of the Ancients
Kick a flying Vulture
Break into a building through the chimney
Roast a live chicken
Collect a bounty for turning in either Leila, Shelby Cross or Galen Weeks
Kick someone off of a rooftop or cliff
Read 50 books
Turn a settlement into a ghost town