taken from xbox360achievements.org
Card #1: THUNDER
Effect: Thunder: Headshots now cause enemies to explode!
Location: Semper Fi
Immediately following getting your gun in the opening cinematic, veer right and head into the first open shack. It’s a damned good vantage point - and looky there - your first Death Card! Enjoy it, this is one of the only times it’ll be this easy.
Card #2: HARD HEADED
Effect: Enemies will take less bullet damage.
Location: Little Resistance
Once you’re facing the large Japanese bunker, tuck and run into the trench on your right. Exit the tunnel and dispose of your adversaries, practically unaware. In the very right corner of the large bunker, you can clearly see the Card standing in the brush.
Card #3: SUICIDE KING
Effect: You’ll get explosive pistol rounds while downed.
Location: Hard Landing
Dispose of as many enemies as possible before running into the building. Before you pass through the structure and on to the outside, look for a small lantern barely lighting the darkened room. You should be able to make out the silhouette of your brand new Death Card.
Card #4: COLD DEAD HANDS
Effect: Enemies take their weapons into the great beyond. No more dropped guns = extremely scarce ammunition.
Right after following Reznov into the first building, wait for him to open up access to the bar. Before following him into the next room, look carefully behind the bar and you’ll find a Death Card in the far corner.
Card #5: STICKS & STONES
Effect: Say goodbye to firearms – you’re armed with nothing but a knife and rocks?
Location: Their Land, Their Blood
After disposing of a tank, sit tight for the short cinema in a barn. Before exiting, head into the first stable on the right and you’ll find a Death Card staked next to a rotting cow corpse.
Card #6: VAMPIRE
Effect: Your health is only recharged by killing enemies, or vampirically...
Location: Burn ‘Em Out
After burn-inating the first mortar hold, head back and to the left towards the second. Take out the embedded machine gunners, and all the other baddies in the area while keeping an eye out for a darkened bunker on the left. If you’ve hit the second mortar stronghold, you’ve gone too far.
Card #7: FLACK JACKET
Effect: Not as in your Flak Jacket. Enemies will now take less grenade damage.
Head into the caves and once you dispose of your Japanese aggressors note that your pathways fork. Staying to the left is easier, but both paths lead to the same place. Either way, a small hallway bridges both pathways and contains a Death Card right in the middle.
Card #8: BODY ARMOR
Effect: Again, not body armor for you. Enemies will die by headshot only.
Location: Ring of Steel
Enter the asylum, and move to the left as safely as you can. You can almost make out the tip of the helmet over the wall. Move into the enclave and find your Death Card next to a slumped soldier.
Card #9: UNDEAD SOLDIER
Effect: Billed as “a different kind of war.” Enemies are now back from the dead.
Move past the German infested kitchen and approach the firefight on the balcony. Slip to the right and drop through the hole in the floor. Against the wall in the exploderized bathroom below is where you’ll find your Death Card.
Card #10: PAINKILLER
Effect: You can now shoot your downed co-op buddies to revive them.
Location: Blowtorch & Corkscrew
Emerge from the caves, grab the Satchel charges and get ready to take out some 200MM gun bunkers. After you blow up the first bunker, head to the left of the level. You’ll see a crude stone structure housing a hanging corpse and a Death Card.
Card #11: BERSERKER
Effect: Get three kills in five seconds and you be momentarily rewarded with Rage mode. You’ll be invincible, but armed with only the knife.
Location: Breaking Point
Having taken out the first two mortars, head up the stairs and take care of the third. Just beyond that, on the right side if you’re facing Shuri Castle, there’s a small shack with a Death Card nestled in it.
Card #12: PAINTBALL
Effect: Shots won’t draw blood, but will instead splatter paint. Oh the humanity.
Location: Heart of the Reich
An easy one. Right after the opening cinema, sprint to the symmetrical subway tunnel on your left. Lo, an unguarded Death Card!
Card #13: VICTORY
Effect: Real war mode – limited HUD, friendly-fire is on, and you’ll bleed out in half the time. You’ve earned it.
Take the staircase up into the theater hallways, you’ll take a right then a left. But instead of making the next left, look to the right for a darkened room. Here be the last Death Card.