Here is the full list of all 50 Metal Gear Solid HD Edition: 2 & 3 achievements worth 1,000 gamerscore.
Complete all VR and Alternative missions
Complete all Snake Tales
Complete a VR or Alternative mission
Collect all dog tags
Hear Johnny's bowel noises in two locations
Break the neck of 30 enemies
Tranquilize 100 enemies
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
Finish game without killing anyone
Find every type of camouflage
Find all 64 Kerotans
Find every type of face paint
Obtain title of MARKHOR
Achieve a camouflage index of 100%
Catch a Tsuchinoko (mythical serpent)
Kill The End before the boss battle
Create the Ocelot Time Paradox
CQC Hold up an enemy
Defeat Fatman
Defeat The Sorrow
Complete Boss Survival
Beat 30 enemies unconscious
Beat the Tanker and Plant chapters on any difficulty
Defeat Solidus Snake
Defeat Metal Gear RAY
Find Emma Emmerich
Defeat Vamp
Destroy the AV-88 Harrier II
Meet Revolver
Defeat Olga Gurlukovich
Disorient an enemy with a cloud of smoke from a fire extinguisher
Get caught by Otacon stimulating yourself
Kiss a poster in a locker
Finish the game on any difficulty
See all of the first-person views that are not indicated by the RB button icon
Defeat The Boss
Defeat Shagohod
Defeat Volgin in a fist fight
Make Snake throw up
CQC Slit an enemy's throat
CQC Slam a guard and knock him out
Defeat The Fury
Defeat The End
Defeat The Fear
Capture any animal alive
Defeat The Pain
Submit Ocelot
Eat a snake of any type