Here is the full list of all 12 Monkey Island 2: LeChuck's Revenge achievements worth 200 gamerscore.
Switched to classic mode at least once.
Complete Part One: Largo Embargo.
Complete Part Two: Four Map Pieces.
Complete Part Three: LeChuck's Fortress.
Complete the game.
Finish the game in under three hours.
Beat the game without using one hint.
Beat the game using fewer than 10 hints.
Allow Guybrush to die.
Complete the game by using object highlighting five times or less.
Guybrush inhales some helium.
Call the LucasArts helpdesk when walking through the jungle on Dinky Island.