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