Here is the full list of all 50 Metal Gear Solid HD Edition: 2 & 3 achievements worth 1,000 gamerscore.
Find every type of face paint
Obtain title of MARKHOR
Catch a Tsuchinoko (mythical serpent)
See all of the first-person views that are not indicated by the RB button icon
Find all 64 Kerotans
Finish game without killing anyone
Find every type of camouflage
Finish the game on any difficulty
Defeat The Boss
Defeat Shagohod
Defeat Volgin in a fist fight
Defeat The Sorrow
Defeat The Fury
Achieve a camouflage index of 100%
Defeat The Fear
Defeat The End
Kill The End before the boss battle
Defeat The Pain
Capture any animal alive
Create the Ocelot Time Paradox
Submit Ocelot
CQC Hold up an enemy
CQC Slit an enemy's throat
Make Snake throw up
CQC Slam a guard and knock him out
Eat a snake of any type
Collect all dog tags
Complete all VR and Alternative missions
Complete Boss Survival
Hear Johnny's bowel noises in two locations
Complete all Snake Tales
Tranquilize 100 enemies
Send Otacon a picture of the marine with no pants
Take a clear photograph of the ghost image in Hold No. 2
Beat 30 enemies unconscious
Get caught by Otacon stimulating yourself
Kiss a poster in a locker
Break the neck of 30 enemies
Complete a VR or Alternative mission
Defeat Solidus Snake
Beat the Tanker and Plant chapters on any difficulty
Defeat Metal Gear RAY
Attain grip level 3
Find Emma Emmerich
Defeat Vamp
Destroy the AV-88 Harrier II
Defeat Fatman
Disorient an enemy with a cloud of smoke from a fire extinguisher
Meet Revolver
Defeat Olga Gurlukovich