Killzone 2 Cheats

Demonslayer - Kill Radec within 20 minutes (Bronze): Kill Radec at Visari Palace within 20 minutes
Dragonslayer - Destroy the ATAC within 1 minute 30 seconds (Bronze): Destroy the Salamun Bridge ATAC in under 1 minute 30 seconds
Elementalslayer - Kill the ArcTrooper within 1 minute 30 seconds (Bronze): Kill the Tharsis Refinery ArcTrooper in under 1 minute 30 seconds
Expert Ribbon (Bronze): Acquire all combat specific medals
Field Agent - Collect all intel (Bronze): Collect all intel within the game
Fragmartyr - Kill 2 Helghast whilst taking your own life (Bronze): Kill 2 Helghast at once and take your own life using a single frag grenade
Fragmerchant - Kill 5 Helghast using a single grenade (Bronze): Kill 5 Helghast at once using a single frag grenade
Giantslayer - Kill the Heavy within 1 minute (Bronze): Kill the Blood Meridian heavy in under 1 minute
Heroic Survivor (Gold): Complete all missions on Elite difficulty level
Iconoclast - Destroy all symbols (Bronze): Destroy all Helghast symbols within the game
Killing Spree - Kill 5 Helghast in 15 seconds (Bronze): Kill 5 Helghast in 15 seconds whilst on foot and maintaining at least 85% health
Maelstra Ribbon (Silver): Complete Maelstra Barrens on any difficulty level
Master Conductor - Electrocute 3 Helghast (Bronze): Electrocute 3 Helghast with a single burst from the VC5 Electricity Gun
Mechspert - Stomp 10 Helghast (Bronze): Stomp 10 Helghast with your Exoskeleton in Maelstra Barrens
Melonpopper - 15 headshots using the sniper rifle (Bronze): Get 15 headshots using the VC32 Sniper Rifle
Pallbearer - Kill 500 Helghast (Bronze): Kill 500 Helghast Soldiers
Professional - 3 revolver headshots in a row (Bronze): Get 3 headshots in a row using the same clip of M4 Revolver ammunition
Reaper - Kill 1500 Helghast (Bronze): Kill 1500 Helghast Soldiers
Run and Gunner - Kill 3 Helghast with one burst of assault rifle fire (Bronze): Kill 3 Helghast using an M82 or StA52 assault rifle without releasing the trigger
Safari Hunter - Kill each enemy infantry type with a melee attack (Bronze): Kill one of each enemy infantry type with a melee attack
Safety First - Shoot off 100 helmets (Bronze): Shoot off 100 Helghast helmets during battle
Salamun Ribbon (Bronze): Complete Salamun District on any difficulty level
Spare Parts - Destroy all Leech Pods (Bronze): Destroy all Leech Pods in The Cruiser
Stick Around - Nail 20 Helghast to the wall (Bronze): Nail 20 Helghast to a wall using the Boltgun VC-21
Suljeva Ribbon (Bronze): Complete Suljeva Village on any difficulty level
Survivor (Silver): Complete all missions on any difficulty level
Tharsis Ribbon (Bronze): Complete Tharsis Refinery on any difficulty level
Treadhead - Kill 30 Helghast whilst in the tank (Bronze): Take 30 Helghast lives whilst using the ISA tank
Undertaker - Kill 1000 Helghast (Bronze): Kill 1000 Helghast Soldiers
Untouchable (Silver): Complete all missions on any difficulty level without dying
Valor Citation (Bronze): Achieve weekly online honor rank #1
Valor Cross (Silver): Achieve weekly online honor rank #3
Valor Grand Cross (Gold): Achieve weekly online honor rank #4
Valor Medal (Bronze): Achieve weekly online honor rank #2
Veteran Ribbon (Bronze): Acquire all mission specific medals
Visari Ribbon (Bronze): Complete Visari Square on any difficulty level
War Hero (Platinum): Collect all Killzone®2 trophies
Wargod Ribbon (Bronze): Acquire all remaining medals

Steel and Titanium Trophies
The downloadable map pack, "Steel and Titanium" is required to unlock these trophies.

Cruiser Assault (Bronze): Boost 5 times in Vekta Cruiser in a round.
Cruiser Engineer (Bronze): Repair 5 objects in Vekta Cruiserin a round.
Cruiser Medic (Bronze): Revive 5 allies in Vekta Cruiser in a round.
Cruiser Saboteur (Bronze): Kill 5 enemies while disguised in Vekta Cruiser in a round.
Cruiser Scout (Bronze): Kill 5 enemies while cloaked in Vekta Cruiser in a round.
Cruiser Tactician (Bronze): 5 allies spawn on your spawn grenade in Vekta Cruiser in a round.
Wasteland Assault (Bronze): Boost 5 times in Wasteland Bullet in a round.
Wasteland Engineer (Bronze): Repair 5 objects in Wasteland Bullet in a round.
Wasteland Medic (Bronze): Revive 5 allies in Wasteland Bullet in a round.
Wasteland Saboteur (Bronze): Kill 5 enemies while disguised in Wasteland Bullet in a round.
Wasteland Scout (Bronze): Kill 5 enemies while cloaked in Wasteland Bullet in a round.
Wasteland Tactician (Bronze): 5 allies spawn on your spawn grenade in Wasteland Bullet in a round.

Flash & Thunder DLC Trophies
Complete each requirement to get the specified Trophy.

Beach Head Assault (Bronze): Boost 5 times in Beach Head during one round.
Beach Head Engineer (Bronze): Repair 5 objects in Beach Head during one round.
Beach Head Medic (Bronze): Revive 5 allies in Beach Head during one round.
Beach Head Saboteur (Bronze): Kill 5 enemies while disguised in Beach Head during one round.
Beach Head Scout (Bronze): Kill 5 enemies while cloaked in Beach Head during one round.
Beach Head Tactician (Bronze): 5 allies spawn on your spawn grenade in Beach Head during one round.
Southern Hills Assault (Bronze): Boost 5 times in Southern Hills during one round.
Southern Hills Engineer (Bronze): Repair 5 objects in Southern Hills during one round.
Southern Hills Medic (Bronze): Revive 5 allies in Southern Hills during one round.
Southern Hills Saboteur (Bronze): Kill 5 enemies while disguised in Southern Hills during one round.
Southern Hills Scout (Bronze): Kill 5 enemies while cloaked in Southern Hills during one round.
Southern Hills Tactician (Bronze): 5 allies spawn on your spawn grenade in Southern Hills during one round.

Napalm and Petrusite DLC Trophies
Complete each requirement to get the specified Trophy. There are 4 Bronze Trophies and 4 Silver Trophies.

Arctower Conqueror (Bronze): Win a round with a minimum of 5 mission wins in Arctower Landing
Arctower Killer (Silver): Kill 50 enemies in one round in Arctower Landing
Boltgun Junkie (Silver): Kill 20 enemies in one round using the Boltgun in Arctower Landing
Boltgun Monkey (Bronze): Kill 10 enemies in one round using the Boltgun in Arctower Landing
Flamethrower Junkie (Silver): Kill 20 enemies in one round using the Flamethrower in Suljeva Cliffside
Flamethrower Monkey (Bronze): Kill 10 enemies in one round using the Flamethrower in Suljeva Cliffside
Suljeva Conqueror (Bronze): Win a round with a minimum of 5 mission wins in Suljeva Cliffside
Suljeva Killer (Silver): Kill 50 enemies in one round in Suljeva Cliffside

Unlock Harder Difficulty
Elite Difficulty: Complete the game.

Medals
Complete certain tasks to unlock medals and rewards:

Aerial Supportive: 8x Air Support Specialist (Unlocks Combine Tactician 2nd Ability)
Army Superior Unit Award: 50x Clan Matches Won with Clan (Unlocks 100,000 Valor)
Assassins League: 5x Assassination Kill Specialist (Unlocks Increased Points/Assassination Kills)
Black Belt: 5x Close Combat Specialist (Unlocks Increased Points/Melle Kill)
Bodyguard Alliance: 5x Assassination Defend Specialist (Unlocks Increased Points per Survival)
Bomb Squad: 5x Search and Destroy Specialist (Unlocks Increased Points/Returns/Disarms)
Corpse Counters: 5x Body Count Specialist (Unlocks Increased Points/Defensive Kills)
Defense Initiative: 5x Capture and Hold Defend Specialist (Unlocks Increased Points/Defensive Kills)
Defensive Specialist: 8x Turret Specialist (Unlocks 2nd Engineer Ability)
Example Soldier: 8x Good Conduct (Unlocks Increased Start Ammo Amount)
Explosives Expert: 8x C4 Specialist (Unlocks Combine Saboteur 2nd Ability)
Field Mechanic: 8x Repair Specialist (Unlocks Combne Engineer 2nd Ability)
Field Medic: 8x Healing Specialist (Unlocks Combine Medic 2nd Ability)
Forward Observer: 8x Spot and Mark Specialist (Unlocks Combine Scout 2nd Ability)
Front Runner: 8x Boost Specialist (Unlocks Combine Assault 2nd Ability)
Hawk's Eye: 5x Sniper Specialist (Unlocks Second Sniper Zoom)
Head Fetish: 5x Headshot Specialist (Unlocks Increased Points/Headshot)
Master of Disguise: 8x Disguise Specialist (Unlocks Saboteur Ability)
Meritorious Unit Award: 10x Clan Matches Won with Clan (Unlocks 1000 Valor)
Meritorious Unit Award: 25x Clan Matches Won with Clan (Unlocks 10,000 Valor)
Natural Born Killer: 8x Kill Count (Unlocks Increased Grenade Amount)
Quick Draw: 5x Sidearm Specialist (Unlocks M4 Revolver 2nd Weapon)
Retrieval Corps: 5x Search and Retrieve Specialist (Unlocks Increased Points/Return)
Shadow Marshall: 8x Cloak Specialist (Unlocks 2nd Scout Ability)
Spawn Authority: 8x Spawn Point Specialist (Unlocks 2nd Tactician Ability)
Trauma Surgeon: 8x Revival Specialist (Unlocks 2nd Medic Ability)

Ranks Unlock Features and Weapons
Unlock higher ranks by earning more points and a higher "Difference" score.

Captain: 1100 points, 300 difference, unlocks VC9 missile launcher
Colonel: 2300 points, 450 difference, unlocks saboteur badge
Corporal: 30 points, 30 difference, can create squad option
General: 2800 points, 500 difference, unlocks scout badge
Lieutenant: 880 points, 250 difference, unlocks engineer badge
Lieutenant-Colonel: 1850 points, 400 difference, unlocks grenade launcher
Major: 1450 points, 350 difference, unlocks tactician badge
Master Sergean: Master Sergeant: 350 points, 150 difference, unlocks the medic badge
Sergeant: 100 point, 70 difference, can create clan option
Sergeant 1st Class: 200 points, 100 difference, unlocks Shotgun and SMG
Sergeant Major: 550 points, 250 difference, unlocks HGH and ISA LMG

Ribbons
Complete certain tasks to unlock ribbons:

Air Support Specialist: 5 kiils by Air Support called
Assassination Defend Specialist: Stayed alive as Target
Assassination Kill Specialist: 1 Assassination Target killed
Body Count Specialist: 10 kills made during a mission
Boost Specialist: Peform 5 Boosts
C4 Specialist: 5 kills by placed C4 Explosives
Capture and Hold Defend Specialist: 10 mission points earned Capturing a Point
Cloak Specialist: Kill 5 enemies while Cloaked
Close Combat Specialist: 10 kills by Close Combat Melee
Disguise Specialist: Kill 5 enemies while Disguised
Good Conduct: 0 Team-Kills/Suicides are made by the player and they have scored at least 20 points
Headshot Specialist: 10 kills by Headshots
Healing Specialist: Heal 5 players
Repair Specialist: Repair 5 Objects
Revival Specialist: Successfully Revive 5 players
Search and Destroy Specialist: 2 Objectives placed/disarmed
Search and Retrieve Specialist: 2 Objectives returned
Sidearm Specialist: 10 kills by Pistols
Sniper Specialist: 10 kills by Sniper Rifle
Spawn Point Specialist: 5 players Spawn on Placed Area
Spot and Mark Specialist: Spot and Mark 5 players
Turret Specialist: 5 kills by Sentry Turret Placed