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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Traitor 30G: Complete Dutch's Flashback leaving no marines alive Mag Lite: 20G Go through all Rookie playing sections with out using the Automag and not trading it. We killed Flipyap!: 10G Get a grunt to go Suicidal and kill 3 grunts around him. Its Stuck!:15G Get a Brute to kill himself with his own grenade. No BR?: 45G Complete the game using only the Automag. No meleing