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No because the 24th spirit stone isnt on the riddle list. The riddler doesnt even know who left these clues(he says so). When you are 240/240 the 24th stone is still blacked out until you find it, thats why they are separate achieves.
GT/PSN: Methionine / GT for FFXI: FFXITAG / Server: Alexander Linkshell: Claimed / 75 DRK/NIN/RNG / Merits: 260