Here is the full list of all 20 The Feud: Wild West Tactics achievements.
Complete Hatfield Story on Normal
Complete McCoy Story on Normal
Complete Hatfield Story on Hard
Complete McCoy Story on Hard
Complete the bonus story on normal
Complete the bonus story on hard
Get 15 kills using a stomp
Get 40 kills using dynamite
Get 50 Gun Dive move kills
Get 30 Kills with Bad Frank
Get 20 headshot critical wounds with Cap Hatfield
Get 100 critical hits with Rita
Use medical attention 30 times with Doc Travis
Get 50 kills with Preacher Thomas
Get 15 critical wounds with Devil Anse Hatfield
Effectively use Jim Vance’s traps 20 times
Get 25 critical wounds with Sam McCoy
Get 20 Double Barrel Blast kills with Randall McCoy
Get 20 kills with Jane Dixon
Get 20 poison kills with Kaitlyn Winspear