Don't Toch That!
Defiant: Prevent the attacking team from touching the flag in a matchmade 1-Flag CTF game.
make sure you do this in multiplayer, not custom games.
Paper Beats Rock!
Defiant: Assassinate a player that just exited Armor-Lock in a matchmade game.
again... make sure you do this in multiplayer, not in custom games.
these achievements are a bit hard, specially the Paper Beats Rock! Try to keep doing it again, if you don't get it, then you might have a problem, or, you just just got unlucky! trust me, i got achivements before and they wouldn't unlock, but ended up unlocking them in the end.