Beat Halo 4, Save 25 Dollars on Your American Express Card

Linking your card with an American Express sync promotional site will net you 25 dollars off your bill if you simply earn the achievement for completion of the games main storyline.

Linking your gamer tag will get you a 10 dollar credit. The first 25 people in the world to complete the game on Legendary difficulty will be given a trip to E3 next year. Having been to my fair share of gaming conventions recently, I can say that alone is worth the effort. It helps that by early accounts Halo 4 is a remarkable achievement for the series and proof that 343 studios understands what they're working with.