Here is the full list of all 21 Western 1849 Reloaded achievements.
Shoot 50 canns
Kill 2000 Bandits
Complete hard difficulty
Fire 5000 bullets
Knock down 250 hats from bandits
Perform 500 perfect reloads
Perform 50 Perfect Reloads in one game
Kill 100 bandits using dynamite
Complete 3 waves in a row without losing any health
Perform a 15 kill streak
Have 2 items equipped in the backpack
Complete medium difficulty
Perform 500 head shots
Upgrade your equipment 3 times
Fire 100 bullets in one game
Perform 50 headshots in one game
Complete easy difficulty
Kill 6 bandits with one clip
Kill 25 bandits in Rage Mode
Complete very hard difficulty
Complete insane difficulty