Here is the full list of all 30 Evil West achievements.
Beat the game on Hard difficulty or higher
Beat the game on Evil difficulty
Have all Weapon Upgrades activated at the same time
Kill at least 30 enemies with each electrically-augmented firearm
Find all hidden perks
Pick up all cash on all missions
Defeat the Bruch on Evil difficulty
Defeat The Parasiter on Evil difficulty
Defeat William Rentier on Evil difficulty
Slam enemies 100 times
Tear off 100 limbs from enemies
All Trophies unlocked. The Weird West is a better place now.
Defeat Felicity D'Abano without using the HP dispenser
Beat the game on Novice difficulty or higher
Beat the game on Normal difficulty or higher
Defeat Felicity D'Abano
Defeat William Rentier
Defeat William Rentier in less than 6 minutes
Defeat the Bruch
Defeat the Bruch without letting it heal.
Defeat The Parasiter without killing any of the minions
Defeat The Parasiter
Use 15 Energy charges
Visit Calico for the first time
Kill 10 enemies in a row using only Gauntlet after obtaining the Revolver
Activate the Supercharged Mode for the first time
Kill 20 enemies using the E-Combo
Hit 45 weakspots
Perform 15 finishers
Cannonball enemies 50 times