Achievements
Complete each achievement to get the allotted gamerscore:

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.
An Object in Motion (15) - Destroy any target using a ramming attack.
City Protector (25) - Destroy drones without civilian damage in the First Flight mission.
Classic Confrontation (15) - Defeat Titanium Man using the Classic armor.
Collateral Damage (15) - Destroy a Prometheus missile by destroying a fuel truck in the Maggia Compound mission.
Decommissioner (25) - Destroy all Prometheus missiles in the Maggia Compound mission.
Disarmed (25) - Destroy stockpiled Stark weapons in the Escape mission.
Eject! (25) - Spare the US fighter pilots in the Stark Weapons mission.
Escape Velocity (25) - Sever the tether before the satellite overloads in the Space Tether mission.
Excelsior! (70) - Complete Hero Objectives for all missions.
Ground Pound (15) - Defeat an opponent using the ground pound in the Extremis armor.
Grounded (15) - Successfully grapple and throw a plane.
Guardian (25) - Protect warehouse workers in the Maggia Factories mission.
Hero (75) - Complete all missions on Normal difficulty (or harder).
Hulk Smash! (15) - Successfully grapple an opponent in the Hulkbuster armor.
Impenetrable (15) - Complete a mission (other than Escape or First Flight) without an armor breach.
In the Drink (25) - Avoid civilian casualties in the Flying Fortress mission.
Launch Aborted (15) - Destroy all Prometheus missiles within 10 minutes in the Maggia Compound mission.
Long Shot (15) - Damage or destroy another enemy while grappling a howitzer..
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.
Not a Scratch (25) - Avoid harming the destroyer and its crew in the Lost Destroyer mission.
Old School (15) - Defeat Iron Monger using the Silver Centurion armor.
Overkill (15) - Defeat a soldier using the Unibeam.
Personnel Vendetta (15) - Defeat 20 soldiers in the Arctic Battle mission.
Power Saver (25) - Avoid disrupting the city\'s power supply in the On Defense mission.
Proton Shut Out (25) - Prevent cannon attacks on civilian targets in the Island Meltdown mission.
Pugilist (15) - Complete any mission (other than Escape) without using weapons systems.
Road King (15) - Destroy all convoy vehicles in less than 2 minutes in the Stark Weapons mission.
Shocking! (25) - Protect outlying occupied buildings in the Save Pepper mission.
Sidekick (75) - Complete all missions on Easy difficulty (or harder).
Smack down (15) - Defeat Titanium Man before his second recharge in the On Defense mission.
Super Hero (75) - Complete all missions on Formidable difficulty.
Tatyana, Interrupted (25) - Protect the nuclear facility in the Arctic Battle mission.
Ten Rings Obsoleted (25) - Complete the One Man Army vs. Ten Rings challenge without an armor breach.
You\'re Fired! (25) - Destroy power regulators in the Iron Monger mission.
Your Own Medicine (15) - Damage or destroy another enemy while grappling a SAM launcher.

Unlock Suits
Successfully complete the game under the Easy difficulty setting to unlock all suits, including Titanium Man.

Alternately, successfully complete the indicated mission to unlock the corresponding suit:

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.
Mark II - Beat the \"One Man Army vs. Ten Rings\" Challenge.
Mark III - Unlocked by Default.
Silver Centurion (Xbox 360 Exclusive) - Beat the Mission \"Showdown\" (or beat the game, since \"Showdown\" is the last mission).

\"AIM-X\" mission: Easy completion
This is a very challenging mission, with anti-air defenses everywhere. Immediately go for the couplings. 
Take as little time as possible on defensive units. If you take your time destroying them and go on to other couplings, 
the couplings will be repaired and defenses will be reinforced. Immediately after their destruction, 
go to the center and destroy defenses. Hide under the platform to recharge your armor. 
Once the defenses are substantially diminished go to the top and strafe Horgan, keeping the cannon below and in front of you. 
When he charges his attack, drop behind the cannon. He will hit it and damage it. 
After a few times of doing this, not only will you defeat Horgan but also get the hero objective of destroying the cannon.

Suit Parts
As you unlock parts to your suit in Story mode, they will become usable in past missions in Mission Archive mode.