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