Here is the full list of all 45 Gunman Tales achievements.
Die 100 times
Eat 100x Mushroom
Throw 100x Dynamite
Visit the Old Mine 100x
Visit the Indian Shaman 100x
Bring a curse of "horse poop" upon yourself!
Drink 10x Antivenom Potion
Use Medallion of Luck 10x
Drink 10x Firewater
Rest 100x in Your House
Visit 100x One of the Two Cities
Shoot the Goldfish 100x
Destroy 10 Cow Skull
Slay the legendary Werewolf
Let Yourself be Killed by a Werewolf
Use Old Spyglass
Gather 1K Dollars
Donate 100 Coins for the Doctor
Find the Alien Corpse
Finish the Game on the "ThumbSucker" Difficulty
Finish the Game on the "Clint Westwood" Difficulty
Catch the 50 Cows
Find the Legendary Lost Treasure!
Finish the Game
Find All Pieces of the Map
Drink 10x Health Potion
Win Stage 6
Win Stage 9
Kill 1K Enemies
Win Stage 12
Win Stage 11
Win Stage 8
Win Stage 10
Win Stage 7
Visit the Saloon 100x
Win Stage 4
Win Stage 5
Find the outlaw Dirty Willy and bring him back ...DEAD OR ALIVE.
Shoot the Chicken 100x
Make 100x Combo!
Win Stage 3
Win Stage 2
Kill Your First Enemy
Obtain Boots of Haste
Win Stage 1