No missable achievements (plus 14 unknown)
Sign in with Steam or Xbox to track your progress, and:
Shoot a flaming dog
Shoot a flaming bear
Kill 100 gunslingers
Rob a bank
Headbutt a train
Shoot down a totem pole
Survive a peyote trip
Defeat the KKKrusher
Ride the Soul Train
Finish story mode
Score a Wild Wild combo
Punch 100 bandits
Get triple drunk
Win the game in No Card Mode