Full list of all 28 West of Loathing achievements. It takes around 20-25 hours to unlock all of the achievements in the base game on Windows.
The base game contains 23 achievements, and there is 1 DLC pack containing 5 achievements.
Buy a crazy horse
Finish the game with Crazy Pete
Become the Necromancer
Finish the game with Gary the Goblin
Blow yourself up at Kellogg Ranch
Find Curly's Meat
Build three kinds of bridges (over three playthroughs)
Learn how cotton candy is made
Finish the game with the Hard Hat in a single game day
Finish the game with the Hard Hat
Finish the game with Susie Cochrane
Give Norton a crown
Reanimate Buffalo Buffalo Buffalo Bill
Fully populate the Dirtwater jail
Leave Boring Springs with 1337 Meat
Buy a pale horse
Contain Roberto
Finish the game with Doc Alice
Learn 69 El Vibrato words
Solve all of Breadwood's problems
Discover 37 map locations out West
Fully populate the Dirtwater morgue
Buy a dark horse
Endure all 10 jump scares in Gun Manor
Dealt with all 13 of the Gun Manor ghosts peacefully
Loved a spittoon that didn't love you back (in Gun Manor)
Discovered the true secret of Gun Manor
Reckoned with all 13 of the Gun Manor ghosts