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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100-GS-never kill and enemy with your weapon (shooting) in campaign any difficulty grenades not included. 100-GS-kill all enemies in firefight by yourself for 10 waves with max players. [Edited on 06.14.2009 8:17 PM PDT]