Audio log (Halo 3: ODST)

Audio Logs are set to be in Halo 3: ODST. They tell the story about a Kenyan girl called Sadie Endesha during the invasion of Earth in October 20, 2552.

There are four [http://halo.wikia.com/wiki/Halopedia:News/24_June_2009/Halo_3:_ODST_Achievements_Discovered! Halo 3: ODST Achievements] that require you to uncover a particular amount of Audio Logs in order to be unlocked.