The Halloween Edition: Sing Me a Pumpkin Add-on for Masters of Puzzle has 7 achievements.
Complete Sing Me a Pumpkin puzzle box with 250 tiles
Complete Sing Me a Pumpkin puzzle box with 500 tiles
Complete Sing Me a Pumpkin puzzle box with 750 tiles
Complete Sing Me a Pumpkin puzzle box with 1000 tiles
Complete Sing Me a Pumpkin puzzle box with 1500 tiles
Complete Sing Me a Pumpkin puzzle box with 2000 tiles
Complete Sing Me a Pumpkin puzzle box in any tileset configuration between the 26th of October and the 10th of November