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