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