Big Boss Emblem - Big Boss Emblem - 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.
Max your plasma cutter > Rig/Stasis > Contact beam.
Hardcore in 5 attempts. (5 Deaths, all from action sequence) Use your stasis, otherwise you're dead. Skip parts that have infinite monster. *Don't* hang around.