Here is the full list of all 15 Nightmares from the Deep: The Cursed Heart achievements worth 1,000 gamerscore.
Ye take yer game playing serious. Ye beat that one in under a minute!
This is how it's done, matey! Arr!
Ye’ve finished all the games o’ Mah-jong. Well played, sir!
Ye’ve left the first half o’ the Mah-jong games in yer wake! Arr!
Ye gave no quarter, ye scourge of the seven seas!
Ye got that one in under a minute. Not one ta waste time, are ye?
Ahoy! Ye bested the game, matey—Ye an old salt now!
Ho, matey! All those cursed coins are now yers. Nicely done!
All games won without a skip! Ye sure ye never played this before?
All o’ them without a hint? Guess ye ain’t the map-usin’ type...
Impressive work, matey, ye finished that game in under a minute!
Ye barely made a mistake! Yer clickin’ hook’s as steady as they come.
Three without reshuffling! An admirable job!
Seems “3” is yer lucky number, ‘ey, matey!
Three games and nay skips—The odds certainly be in yer favour now!