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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Nothing But Head 100gs- Finish The Campaign with every kill being a headshot on normal or up difficulty. You Got Some Blue There 100gs- Finish The Campaign with every kill being a stick by a plasma grenade. Best There Is 50gs- Complete all levels of Campaign ,Firefight and all achievments in multiplayer Stop Playing 5gs- Play for 2 weeks. Sneaky, Sneaky, Sneaky 50gs- Complete The Campaign without alerting more than 30 of the covenant and/or without killing more than 15 of the covenant I think some of these are fairly well thought out. [Edited on 06.13.2009 5:32 PM PDT]