The Incredible Adventures of Van Helsing III

There is a nice glitch that allows you to play the entire game on casual, and still get the achievements for beating the game on fearless, heroic, and hard.

1) Start the game on casual. Pick whatever class you want. I personally picked the bounty hunter.
2) Beat the entire campaign on casual.
3) Exit to the main menu of the game and create a new character on Fearless difficulty (I personally used the bounty hunter again. I am not sure if it works if you choose a different class for your second run. Some people say that it works. I say to just use the same class again).
4) Play the first mission for about 5 minutes.
5) Quit to the main menu, and then dashboard quit the game (on the Xbox dashboard click start, and then quit game).
6) Load the game with your fearless character and you should pop all three achievements.

For your first run of the campaign you can change the difficult. For example, you can start on fearless, decide that it's too difficult, and lower the difficulty to casual. The glitch will still work and you will get the achievements.