Here is the full list of all 15 Metal Gear Solid V: Ground Zeroes achievements worth 1,000 gamerscore.
Cleared all missions (including Side Ops and Extra Ops)
Obtained all XOF unit patches
In the "Ground Zeroes" mission, rescued the prisoner to be executed and extracted him via chopper
Cleared any mission (including Side Ops and Extra Ops) with a S-rank
Cleared the "Classified Intel Acquisition" Side Op while riding in the back of a truck
Cleared a Side Op or Extra Op
Cleared the "Ground Zeroes" mission
Reunited with Chico or Paz
Clear all missions (including Side Ops and Extra Ops) with a S-rank
Clear the "Eliminate the Renegade Threat" Side Op by extracting both targets
Clear the "Intel Operative Rescue" Side Op without killing a single enemy
In the "Destroy the Anti-Air Emplacements" Side Op, rescue and extract all prisoners via chopper
Unlock all trials
Obtain all cassette tapes
Clear the "Jamais Vu" Extra Op with 0 enemy combat statuses