Here is the full list of all 13 Hot Noon achievements.
Start the game for the first time!
Trade 40 shots in one round!
Have a round last 3 minutes!
Win all rounds of one game!
Next round decides it all!
Win a duel against another cowboy, while Bullet Speed settings are set on High!
Win a game with lowest resolution and fullscreen on!
Win a game against Easy Enemy AI!
Win a game against Mid Enemy AI!
Win a game against Hard Enemy AI!
Catch 5 or more bullets in a combo!
Achieve a draw!
Hoard all the bullets and then get killed by the safe!