FaceCamo - Defeat the Battle Beauty Laughing Octopus (the overall battle, no specifics involved).

Laughing Octopus - Defeat the Battle Beauty (human form) Laughing Octopus by non-lethal means.

Raging Raven - Defeat the Battle Beauty (human form) Raging Raven by non-lethal means.

Crying Wolf - Defeat the Battle Beauty (human form) Crying Wolf by non-lethal means.

Screaming Mantis - Defeat the Battle Beauty (human form) Screaming Mantis by non-lethal means.

Roy Campbell - Shock Colonel Campbell using the Metal Gear II during the intermission scene.

Otacon - Shock Dr. Emmerich using the Metal Gear II during the intermission scene.

Raiden Mask A - Shock Sunny using the Metal Gear II during the intermission scene.

Raiden Mask B - Shock Dr. Naomi Hunter using the Metal Gear II during the intermission scene.

Drebin - Purchase and keep more than 60 different weapons.

Big Boss - Earn the Big Boss emblem on a single-player session by doing the following: instigate no alerts; kill no enemies (not even bosses); do not continue (at all); do not use life recovery items (at all); do not use the stealth suit or bandanna special items (you may possess, but not activate them); and complete the game on Big Boss Extreme difficulty under 5 hours.