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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Jesus In Battle Armor? 10Gp-kill two hunters under a minute without dieing or useing a spartan lazer or gernaides. Who Needs Staroids? 5Gp-kill 20 covenant forces with melee attacks Silent but Deadly 10Gp-complete a mission with only silenced weapons Who's Your Daddy? 20Gp-kill every brute, jackel, and/or hunter in the area and make the grutes coware in fear. [Edited on 06.18.2009 12:32 AM PDT]