Who does the achievement voice in Halo Reach

The Announcer (voice by Jeff Steitzer) is the male voice in Halo: Combat Evolved, Halo 2, Halo 3, Halo 3: ODST, and Halo: Reach multiplayer that calls out certain phrases when the criteria are met (like the Announcer calling out medal titles when certain medals are obtained and general events in the game).



Sources:
Halo wikipeida