As noted by the great community here at TA, it appears that you don't need to purchase the game. You can download the trial and earn all five achievements! Original Story:
It took some time for everything to be sorted out
with Puzzle by Nikoli X Sudoku (Win 8)
. The game was originally released in September last year and carried the LIVE banner, but the achievements were missing in action. Then in February of this year, it finally received its LIVE status, but not until after the game was removed from the marketplace.
It has now officially been re-released, LIVE enabled, on the marketplace. You can now earn all five of the achievements for an easy 200 Gamerscore. You can jump to the marketplace by clicking here
. Puzzle by Nikoli X Sudoku
is priced at $1.49 on the Windows 8 Store. Make sure that you pick it up soon because with this game, you just never know what is going to happen!