Here is the full list of all 14 Lone McLonegan : A Western Adventure achievements.
Get the map
Blow up "The Safest Safe In The Wild West (TM)"
Throw the cat using the giant slingshot
Take part in the TV show
Finish the chain of favors
Now I have a gun. Ho-ho-ho
Defeat Badass and become "The Most Wanted Outlaw In The Wild West (TM)"
Play Don't Shoot First
Fan the fire
Squeeze a cactus
Get a succulent and juicy pickle
Rob a sack full of money
Kick Badass’ statue
Give Mary a sarsaparilla can