Unlockables
     Complete each achievement to get the allotted gamerscore.

Unlockable               How to Unlock:

Sidekick (75)            Complete all missions on Easy difficulty 
                         (or harder)

Hero (75)                Complete all missions on Normal difficulty 
                         (or harder)
                         
Super Hero (75)          Complete all missions on Formidable difficulty

Disarmed (25)            Destroy stockpiled Stark weapons 
                         in the Escape mission

City Protector (25)      Destroy drones without civilian damage 
                         in the First Flight mission

Decommissioner (25)      Destroy all Prometheus missiles 
                         in the Maggia Compound mission

In the Drink (25)        Avoid civilian casualties 
                         in the Flying Fortress mission

Tatyana, 
Interrupted (25)         Protect the nuclear facility 
                         in the Arctic Battle mission

Not a Scratch (25)       Avoid harming the destroyer and its crew 
                         in the Lost Destroyer mission

Power Saver (25)         Avoid disrupting the city's power supply 
                         in the On Defense mission

Shocking! (25)           Protect outlying occupied buildings 
                         in the Save Pepper mission

Proton Shut Out (25)     Prevent cannon attacks on civilian targets 
                         in the Island Meltdown mission

Escape Velocity (25)     Sever the tether before the satellite overloads 
                         in the Space Tether mission

You're Fired! (25)       Destroy power regulators in the Iron Monger mission

Excelsior! (70)          Complete Hero Objectives for all missions

Ten Rings Obsoleted (25) Complete the One Man Army vs. Ten Rings challenge 
                         without an armor breach

Maggia Obsoleted (25)    Complete the One Man Army vs. Maggia challenge 
                         without an armor breach

Mercs Obsoleted (25)     Complete the One Man Army vs. Mercs challenge 
                         without an armor breach

AIM Obsoleted (25)       Complete the One Man Army vs. AIM challenge 
                         without an armor breach

AIM-X Obsoleted (25)     Complete the One Man Army vs. AIM-X challenge 
                         without an armor breach

Air Superiority (15)     Destroy all dropships before the Stark Gunship 
                         is stolen in the First Flight mission

Road King (15)           Destroy all convoy vehicles in less 
                         than 2 minutes in the Stark Weapons mission

Launch Aborted (15)      Destroy all Prometheus missiles within 10 minutes 
                         in the Maggia Compound mission

Collateral Damage (15)   Destroy a Prometheus missile by destroying 
                         a fuel truck in the Maggia Compound mission

Personnel Vendetta (15)  Defeat 20 soldiers in the Arctic Battle mission

Overkill (15)            Defeat a soldier using the Unibeam

Smack down (15)          Defeat Titanium Man before his second recharge 
                         in the On Defense mission

Impenetrable (15)        Complete a mission (other than Escape 
                         or First Flight) without an armor breach

An Object in Motion (15) Destroy any target using a ramming attack

Grounded (15)            Successfully grapple and throw a plane

Your Own Medicine (15)   Damage or destroy another enemy while grappling 
                         a SAM launcher.

Long Shot (15)           Damage or destroy another enemy while 
                         grappling a howitzer.

Hulk Smash! (15)         Successfully grapple an opponent 
                         in the Hulkbuster armor.
                         
Ground Pound (15)        Defeat an opponent using the ground pound 
                         in the Extremis armor.

Classic 
Confrontation (15)       Defeat Titanium Man using the Classic armor.

Old School (15)          Defeat Iron Monger using the Silver Centurion 
                         armor.

Pugilist (15)            Complete any mission (other than Escape) 
                         without using weapons systems.
                         
Eject! (25)              Spare the US fighter pilots 
                         in the Stark Weapons mission.

Guardian (25)            Protect warehouse workers 
                         in the Maggia Factories mission.


Unlockable Armors for use in One Man Army Mode, and Mission Archive
     Armors  can  always be used in One Man Army Mode, but you have to
beat  the  game  first  to  use other Armors (besides the Mark III) in
Mission Archive.

Unlockable:              How to Unlock:

Mark III                 Unlocked by Default

Mark II                  Beat the "One Man Army vs. Ten Rings" Challenge

Classic                  Beat the "One Man Army vs. Mercs" Challenge

Classic Mark I           Beat the "One Man Army vs. AIM" Challenge

Extremis                 Beat the "One Man Army vs. Maggia" Challenge

Hulkbuster               Beat the "One Man Army vs. AIM-X" Challenge

Silver Centurion 
(Xbox 360 Exclusive)     Beat the Mission "Showdown" (or beat the game, 
                         since "Showdown" is the last mission)