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