I TAKE NO CREDIT FOR THIS SOLUTION. It can be found here:
http://uk.ign.com/wikis/metal-gear-solid-5-ground-zeroes/Mis...Normal difficulty:
Ground ZeroesFastest marking all enemies
Fastest Neutr. of all Enemies
Eliminate the Renegade ThreatFastest marking all enemies
Fastest Neutr. of all Enemies
Intel Operative RescueFastest Neutr. of all Enemies
Classified Intel AcquisitionFastest marking all enemies
Fastest Neutr. of all Enemies
Destroy the Anti-Air EmplacementsFastest marking all enemies
Fastest Neutr. of all Enemies
Deja VuFastest marking all enemies
Fastest Neutr. of all Enemies
Fastest Collection of all Mines
Fastest Extermination of all Crows
Fastest Unlocking of all doors
Hard difficulty:
Ground ZeroesFastest Completion Time
Fastest Completion Time (stealth, no kills)
Fastest Comp. Time (no weapons used)
Fastest Cell-to Chopper Paz Rescue
Eliminate the Renegade ThreatFastest Completion Time
Fastest Completion Time (stealth, no kills)
Fastest Comp. Time (no weapons used)
Fastest Target Extraction of Both Targets
Intel Operative RescueFastest Completion Time
Fastest Shooting of all Moai
Classified Intel AcquisitionFastest Completion Time
Fastest Completion Time (stealth, no kills)
Fastest Comp. Time (no weapons used)
Fastest Acquisition of Second Tape
Destroy the Anti-Air EmplacementsFastest Completion Time
Fastest Completion Time (stealth, no kills)
Fastest Comp. Time (no weapons used)
Fastest Destr. of Woden Watchtowers
Deja VuFastest Completion Time
Fastest Completion Time (stealth, no kills)
Fastest Erasing of all Markings
Fastest Completion of FOX Logos
Fastest Extermination of all Rodents
Misc:
Overall Trial Records
Longest Range Headshot
Longest Range Headshot (tranq.)
Farthest Distance Enemy Sent Flying
Longest Two-Wheel Driving Time