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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Deadly Shadow - 10GS "Kill an enemy patrol without alerting them to your presence." THIS! IS! MOMBASA!!! - 50GS "Kill a Brute Chieftain using melee attacks only." A time to die. . . Or not. - 5GS "Use a health-pack when below 10% health." Gravity blows. . . - 10GS "Bring a building down on an enemy." Shotgun! - 10GS "Kill 10 enemy's from the passenger seat of a Warthog." I'll get you on the respawn! - 5GS (Secret) "You were the first to die in a game of Firefight, poor you." Conversationalist - 100GS "Find every single last AI terminal within the game." Oh lordy. . . - 100GS "Beat a Scarab back to boot-camp." Grunt-Chunks. - 10GS "Caused a Grunt BBQ."