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