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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Explosive Master: Take out 7 bad guys with a single explosion. 2 Heads Are Better Than one: Get To Head Shots With A Single Sniper Bullet. ODST: Complete story line on any difficulty. Savior: Rescue 4 Comrades Those are some I can thank of right now but i'll come up with some more later.