ok w.e. but i found a couple glitches, they may have already been posted though.
In foundation: go to the room with the odd looking metal devices that say test on them. Jump on the one that is stadnding up. jumo to the area up there and whenever someone walks by the doorway just kill um, and they will have no idea where you are.
Lockout: Go to the room with the glass and jump 8 times, press crouch then go backwards, after that, jerk backwards quickly then jump, you will be stuck and nobody can see you.
Accention: Go to the banshee and shoot both wings untill they blow up, get in the banshee and go to the sniping tower thing. Put the banshee there and make it so that when you jump out, you fall into the fog, you will make it to the bottom without dying. you wont have shields though, but there is a sword and a battle rifle down there. If you jump, its like a superjump to the top of the level. Crouch on the top of te level and jump, you wil fall and die. You have to get this one PRECISELLY right or else it wont work.
Burial mounds: this one is VERY weird. Get outside the level and when you do, make sure you have a rocket and a sword, use the rocket, and shoot all your rockets at a meteor coming down. after all your rockets are gone, start swinging your sword. eventually the recticle will turn red and a meteor will hit you. You will die but it is REALLY awesome. i saw my frind do it at his house so if it doesnt work, dont blame me because i was just watching what he was doing.