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