0 1 1This is unlocked after finding the 6 secret puzzle pieces. These secrets each have an associated achievement: Not So Sharp, Stirring things Up, Frosty Friend, Strange Catch, Ground of Applause, and Cawtet.Showing only comment. Leave a comment. If you have done all of the 6 secrets and have got the puzzle pieces go to "secrets" in the main menu. It will show that you have the 6 puzzle pieces that form grandma's airship. You will then be on the airship and the achievement will pop. If you have done everything else the 100% achievement will pop too.Posted by Sailorbrown79 on 14 Jan at 18:30 Leave a comment