Since there is no confirmation on what the achievements will be for the game, aside from the time being, let's create our own!
Here's some of mine:
"KEEP IT CLEAN - 10 GS: destroy all environmental objects within the city."
"Terminator - 50 GS: Never use a health pack"
"Ray Charles? - 50 GS: Never use the low-light mode, VISR"
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Dude, help us out! - 25g - Complete 10 waves on firefight w/out killing a single enemy This game is "M" Rated - 0g - Play Halo 3:ODST under the age of seventeen LEROY JENKINS!!! - 50g - Complete 20 waves of firefight with a close range weapon w/ out camping Stealth what? - 25g - Complete campaign on normal or above dificulty without a silenced weapon Suicide Bomber - 25g - Stick yourself with a plasma grenade and kill a brute EDIT: Thought of some more This is familiar... - 5g - Play Halo: ODST after playing Gears of War 2 Louisville Slugger - 25g - Complete ten firefight waves on heroic or legendary with over half of your kills from the gravity hammer Back to the Start - 25g - Complete ten firefight waves on heroic or legendary with over half of your kills from the Halo 1 pistol [Edited on 06.15.2009 2:00 PM PDT]