This update adds achievements for completing abstract puzzles! There are six total, one for each puzzle size category and one for completing all of them. If you've already completed some or all of the abstract puzzles, simply opening up the game should cause any resulting achievements to immediately pop up.
Additionally, puzzles in the puzzle select screens now display a checkmark next to the title of the puzzle when they're completed, and, in the main menu, a checkmark displays on the puzzle collection button (either "Original Puzzles" or "Abstract Puzzles) when all the puzzles in said collection are complete.