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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"You want Genesis?" 5g Find the hidden Sega Genesis and destroy it. "How'd they get here!?" 20g encounter and survive the flood "Wort Wort Wort!" 5g Discover the secret Elite "You must construct additional Pylons!" 30g Kill a brute cheiftan using a traffic pylon. "I am the Walrus!" 20g Beat down a brute cheiftan using the Brute Spiker "the better to kill you with..." 50g Kill at least one enemy with each weapon in the game in firefight mode without dying. "Kill it with Fire!" 20g Burn a brute Cheiftan to death using the flame thrower on Legendary difficulty "Nice ride... Mine Now!" 10g Jack an enemy Ghost That's all i can think of for now.