Special Grenade x3: Reach Level 4 (three special grenades, no smoke).
Satchel Charge x2: Reach Level 4 (two remote detonation explosives).
M9A1 Bazooka x2: Reach Level 4 (bazooka with two rockets).
Bomb Squad: Reach Level 16 (seek out enemy explosives).
Bouncing Betty x2: Reach Level 24 (two pressure activated mines).
Bandolier: Reach Level 40 (extra ammunition magazines).
Primary Grenade x2: Reach Level 44 (two primary grenades).
M2 Flamethrower: Reach Level 65 (projects a controlled stream of fire).
Perk Slot 2
Stopping Power: Reach Level 4 (increased bullet damage).
Fireworks: Reach Level 4 (higher explosive weapon damage).
Flak Jacket: Reach Level 4 (reduce explosive damage).
Gas Mask: Reach Level 4 (protect against Tabun Gas).
Juggernaut: Reach Level 4 (increased health).
Camouflage: Reach Level 12 (undetectable to enemy recon planes).
Sleight Of Hand: Reach Level 28 (faster reload).
Shades: Reach Level 32 (reduce intensity of signal flares).
Double Tap: Reach Level 36 (increased rate of fire).
Overkill: Reach Level 56 (carry two primary guns, no pistol).
Perk Slot 3
Deep Impact: Reach Level 4 (deeper bullet penetration).
Extreme Conditioning: Reach Level 4 (sprint for longer distances).
Steady Aim: Reach Level 4 (increased hip fire accuracy).
Toss back: Reach Level 6 (reset fuse of picked up grenades).
Second Chance: Reach Level 9 (revive downed allies).
Martyrdom: Reach Level 20 (drop a live grenade when killed).
Fireproof: Reach Level 48 (reduce fire based weapon damage).
Dead Silence: Reach Level 52 (less sound when you move).
Iron Lungs: Reach Level 60 (longer breath hold while sniping).
Reconnaissance: Reach Level 64 (show enemy dogs, artillery, and tanks).
Vehicle Perks
Water Cooler: Reach Level 4 (decreased turret overheat).
Greased Bearings: Reach Level 4 (increased turret rotation speed).
Ordnance Training: Reach Level 12 (decrease reload time of turrets).
Lead Foot: Reach Level 28 (increases tank top speed).
Coaxial Machine Gun: Reach Level 40 (driver controlled machine gun).
Death Card locations
The Death Cards can be found at the following locations. Collect a Death Card to unlock its effect in Co-op mode.
Thunder
Mission: Semper Fi (Eight of Hearts)
Effect: Headshots cause enemies to explode
Location: At the very beginning after leaving the shack, you will see another shack to the right. The card is inside.
Hard Headed
Mission: Little Resistance (Four of Clubs)
Effect: Enemies take less bullet damage
Location: At the end of the mission before going into the last building, look to the right. The card is in a corner of bushes.
Suicide King
Mission: Hard Landing (King of Hearts)
Effect: Fire explosive pistol rounds while downed
Location: About halfway through the mission you will see a big building with a mini-trench outside. Enter the building, and go into the lower level. The card is to the right when you go into the room with the stairs.
Cold Dead Hands
Mission: Vendetta (Five of Diamonds)
Effect: Enemies take their weapons with them to the grave
Location: After the sniper section at the first part of the mission, Reznov will lead you through a building. Follow the bar around to the end to find the card.
Sticks & Stones
Mission: Their Land, Their Blood (Joker)
Effect: Your weapon arsenal consists of a knife and rocks
Location: Destroy the tanks, and go through the barn. Search the stalls to your right to find the card.
Vampire
Mission: Burn 'em Out (Queen of Hearts)
Effect: Can only recharge your health by getting kills
Location: Just before the second mortar position is a bunker to the left. The card is inside.
Flak Jacket
Mission: Relentless (Nine of Diamonds)
Effect: Enemies take less explosive damage
Location: At the end of the mission, take either the left or right path. Eventually the paths will reconnect. The card is about halfway down the path.
Body Armor
Mission: Ring of Steel (Jack of Spades)
Effect: Enemies die by headshot only
Location: Enter the asylum, the immediately go to the left. The card is in the far bottom left corner.
Undead Soldier
Mission: Eviction (Ace of Spades)
Effect: Enemies come back from the dead
Location: During the first half of the mission, just after the kitchen area, you will eventually see a room to your right that has a large hole in it. Drop down to find the card.
Painkiller
Mission: Blowtorch & Corkscrew (Ten of Clubs)
Effect: Shoot downed Co-op teammates to revive them
Location: Go to the left as you move toward the second bunker. A Japanese soldier hanging upside down is near the card.
Berserker
Mission: Breaking Point (Three of Diamonds)
Effect: Get three kills in five seconds to become Berserk
Location: Clear all four mortar pits, then go to the small shack in the south of this area. The card is inside.
Paintball
Mission: Heart of the Reich (Six of Clubs)
Effect: Paintball guns
Location: The card is in the closed-off subway entrance across the street from the start of the mission.
Victory
Mission: Downfall (Two of Spades)
Effect: Limits your HUD, turns on friendly fire, and bleed out in half the time
Location: Before you get to the theater, some of your allies will break through a door to your right. The card is past that door.
WARNING:Prestige takes away all weapons,challenges and attachments you have completed or won,and you will start at level one.