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.
Finish the game with Doc Alice
Leave Boring Springs with 1337 Meat
Finish the game with Gary the Goblin
Build three kinds of bridges (over three playthroughs)
Fully populate the Dirtwater morgue
Blow yourself up at Kellogg Ranch
Contain Roberto
Finish the game with the Hard Hat
Finish the game with the Hard Hat in a single game day
Find Curly's Meat
Learn how cotton candy is made
Become the Necromancer
Finish the game with Crazy Pete
Give Norton a crown
Fully populate the Dirtwater jail
Reanimate Buffalo Buffalo Buffalo Bill
Solve all of Breadwood's problems
Buy a dark horse
Buy a crazy horse
Finish the game with Susie Cochrane
Learn 69 El Vibrato words
Discover 37 map locations out West
Buy a pale horse
Endure all 10 jump scares in Gun Manor
Dealt with all 13 of the Gun Manor ghosts peacefully
Discovered the true secret of Gun Manor
Loved a spittoon that didn't love you back (in Gun Manor)
Reckoned with all 13 of the Gun Manor ghosts