So the point of this topic is that you post serious made up acheivments for ODST here. And then others can do them just for fun as a challenge, obviously you Don't earn anything. Heres are examples:
Complete any Night firefight level without turning on or using your night vision visor, with a Sniper Rifle, Auto mag and grenades on heroic.
or
kill a wraith on rally point using only a magnum (on normal or herioc) =]
they don't have all have to be hard though.