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