Microsoft has unlocked an achievement for the game Halo 4. In terms of financials, Halo 4 can be considered the largest entertainment launch of the year since they hit $220 million in one day of sales. According to the Halo Waypoint blog, over one million people have already completed the single player campaign. This means that players spent 13.5 million hours of gameplay for the campaign and over 31.4 million hours were spent playing the game in the first 5 days. The most impressive number for the first 5 days: 4.5 billion kills.