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