Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Band of Brothers	Unknown.
Blast Radius	Kill at least three enemies with a single grenade.
Can it run Crysis?	Complete In at the Deep End.
City That Never Sleeps	Complete six levels on Veteran difficulty.
Close Encounters	Stealth kill 25 enemies.
Crossroads of the World	Complete the evacuation at Times Square.
Dark Night of the Soul	Defend Central Station.
Death Grip	Kill ten enemies with grab and throw.
Death Slide	Kill five enemies while sliding.
Evolution	Complete twelve levels on Veteran difficulty.
False Prophet	Find Nathan Gould.
Fastball	Kill ten enemies by throwing an object at them.
Fire Walker	Assist the evacuation at Bryant Park.
Food for thought	Unknown.
Foreign Contaminant	Escape the Battery Park evacuation center.
Headhunter	Kill four enemies in a row with headshots.
Heart of Darkness	Complete six levels on Post-Human Warrior difficulty.
Hole in One	Unknown.
Home Stretch	Reach Central Park.
Hung Out to Dry	Reach the Hargreave-Rasch building.
Internal Affairs	Infiltrate the CELL facility at Wall Street.
Into the Abyss	Infiltrate the alien hive.
Literary Agent	Unknown.
Medal of Honor	Complete twelve levels on Post-Human Warrior difficulty.
Men of Destiny	Complete the single player campaign on Veteran difficulty.
More than Human	Assimilate alien tissue at the crash site.
Once a Marine, Always a Marine	Assist the Marines in Madison Square.
Popcorn	Kill twenty enemies with the Microwave cannon.
Post-Human Warrior	Complete the single player campaign on Post-Human Warrior.
Speeding Ticket	Unknown.
Start Spreading the News	Finish the single player campaign on any difficulty.
Stealth Assassin	Unknown.
The Tourist	Unknown.
Theseus at Last	Locate Jacob Hargreave.
Two Heads Are Better Than One	Unknown.