The Halloween 2020 Title update for Tower Unite has 11 achievements.
Buy every Ghoulcery item
Befriend the Halloween characters
Uncover the 10 hidden bones in the Plaza
Deliver 100 remains
Deliver 50 remains
Collect 100 Ghoul Coins
Collect 50 candy
Find all 131 Jack o' Lanterns in the Plaza
Find the haunted treasure
Find Lil' Pup
Open a Halloween catsack