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.
Discovered the true secret of Gun Manor
Dealt with all 13 of the Gun Manor ghosts peacefully
Reckoned with all 13 of the Gun Manor ghosts
Endure all 10 jump scares in Gun Manor
Loved a spittoon that didn't love you back (in Gun Manor)