You must obtain a minimum of the points required to unlock the difficulity. It can be obtain by using the point multiplier to increase the points at the end of the game.
Unlimited Ammo for the Seburo, submachine gun, assault rifle, shotgun, hand grenades, spark grenades, and knives for Single-Player Campaign.
Complete the game on Easy Mode
Three additional costumes for Motoko Kusanagi, three additional costumes for Batou, and yellow menus for Single-Player Campaign
Complete the game on Easy Mode
Playable Motoko Kusanagi and Batou, and unlocking Dome Level in Multiplayer Game
Complete the game on Easy Mode
Three additional paint jobs for Tachikoma for Single-Player Campaign & Playable Tachikoma in Multiplayer Game
Complete the game on Hard Mode
Armed Suit and Think Tank playble in Multiplayer Game
Complete the game on Normal Mode
1/9/2006
Collect/Destroy Fan Unlockables
The fans are available after you complete the game once. You must DESTROY the fan to collect it. 10 fans per level, and you do not need to them in a specific order.
Napalm Launcher for Motoko Kusanagi, Laser Gun for Batou, and unlimited ammo for laser gun and napalm launcher for Single-Player Campaign.
Collect/Destroy all 120 fans
Laser gun and Napalm launcher unlock for use in Multiplayer Game.
Collect/Destroy all 120 fans
1/9/2006
No Continue Unlockable
You must complete each 12 levels without using a continue to unlock. Do not confused this with the Continue at the menu screen. When you select Continue on the menu screen, look for an icon on the corner of the screen. When you see it, that means the level has been past without using a continue. There is no specific order of levels needed to be done to unlock.