Here is the full list of all 50 Metal Gear Solid HD Edition: 2 & 3 achievements worth 1,000 gamerscore.
Create the Ocelot Time Paradox
Beat the Tanker and Plant chapters on any difficulty
Defeat Solidus Snake
Defeat Metal Gear RAY
Hear Johnny's bowel noises in two locations
Beat 30 enemies unconscious
Find Emma Emmerich
Defeat Vamp
Destroy the AV-88 Harrier II
Tranquilize 100 enemies
Defeat Fatman
Attain grip level 3
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
Complete a VR or Alternative mission
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
CQC Slam a guard and knock him out
CQC Slit an enemy's throat
Disorient an enemy with a cloud of smoke from a fire extinguisher
Kiss a poster in a locker
Defeat The End
Kill The End before the boss battle
Defeat The Pain
Make Snake throw up
Submit Ocelot
CQC Hold up an enemy
Capture any animal alive
Meet Revolver
Defeat Olga Gurlukovich
Eat a snake of any type
Break the neck of 30 enemies
Complete Boss Survival
Complete all Snake Tales
Collect all dog tags
Complete all VR and Alternative missions
See all of the first-person views that are not indicated by the RB button icon
Achieve a camouflage index of 100%
Catch a Tsuchinoko (mythical serpent)
Find every type of camouflage
Find every type of face paint
Obtain title of MARKHOR
Find all 64 Kerotans