Prototype Unlockable: Body Surf|
To unlock a new ability called "Body Surf," navigate to the Cheats menu (under "Extras" in the Main Menu) and enter this code: RIGHT, RIGHT, LEFT, DOWN, UP, UP, UP, DOWN
Prototype Unlockable: New Game +
Once you beat Story Mode, you'll be able to play through it again with all of your powers and upgrades.
First you must unlock the Kill Event called "Rolling Thunder," which appears between the East Village and the Lower East Side (one block from the East coast). Right next to the Event is a Thermobaric Tank. Jumping into it will activate the Event, but you can back out of it before the Event begins. Do this correctly and you'll have a free tank. Note: If you exit the tank it or use it to destroy a Hive or Base it will vanish. You can grab it again at the Event point.
Final Boss Strategy
After the cut scene ends, quickly switch to Armor and Blade (Infected Vision also helps). Stay away from your opponent until he starts to jump after you. When he lands, hit him with the Air Blade Slash. Get in a couple of good hits and he should be stunned. Grab him and repeatedly hit the PUNCH button. If he knocks you down to critical, use a Devastator move to stun him.
Unlockable: Platinum / Radical Events
Earning a Gold in every event unlocks Platinum Events, which are more difficult. Radical Events can be unlocked in the same manner and are even more difficult.
Unlockable: Hard Mode
Beat the game on Normal to unlock Hard Mode.
Unlimited EP Exploit
On mission 22/31, where you get the first cell phone cut scene, you'll be asked to jack a Black ops helicopter. Once you have the helicopter, you are prompted to pick up a few Black Ops guys and then destroy a Hive. Do not destroy the Hive!
You now have a helicopter with unlimited missiles, no time limit, and as long as you don't destroy the Hive, you can blow up anything else without it kicking off the alert meter. This also allows you to get out of the helicopter without it ending the mission (useful for collect Memory Strands).
The easiest way to get EP in this is to switch to your Infected Vision and fly around blowing up infected water towers. You can save your game in the middle of this mission if you need a break and do the same thing. You can max out your skills and then some using this exploit.
Smooth Landing Speed Boost
After jumping, avoid using both of your dashes while airborne and save one to use just before landing. If timed correctly, you should hit the ground at near full speed, which is very useful when attempting to evade the military or during a timed activity. Note: This doesn't work for the highest of drops.
Mind the Crows
Infected water towers are always circled by squawking crows. This makes it easier to track them down
Easy "Butcher" Achievement
Once you've attained the Critical Mass and Tendril Devastator upgrades, simply choose a disguise (in order to keep a low profile), walk into the middle of Times Square, wait until you are surrounded by people and unleash the Tendril Devastator this will land you "The Butcher."
It's sometimes difficult to spot Landmark and Hint Collectibles. Switch on your Infected Vision (or Thermal Vision) to help discern them.