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