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