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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Ub3r L337 - 50g - Have a screenshot, video, map, and/or gametype featured in the bungie favorites. You killed Flipyap![secret achievement] - 5g - Have a grunt say a funny, hidden quote Work All Day - 10g - Kill a wave of enemeies in firefight w/out hesitating between shots (doesn't include reloads) Mean Mean Pride - 25g - Kill a brute chieftain with a spartan laser then t-bag said chieftain