Throughout the game you will in-no-doubt become familiar with spamming A for the Keyblade combat.
During several stages you will be presented with ‘Press Y for ….’ which is typically a special ability or combo move.
Throughout the first hour of the game you will most likely be presented with ‘Press Y for pirate ship’ and/or ‘Press Y for crazy teacups’ both of these will unlock the achievement.
Reeally simple
If you play the game for more than 90 minutes and don’t have this i would be surprised :)