The Little Acre

Story-related; cannot be missed.

When you're outside the house as Lily, click on the wrench in the tractor to open it, then click on the tractor again to get a hose. Click on the hole at the base of the chimney to get a bone. Use the hose on the tree branch to make a swing, then try to use the swing. Use the bone on the dog to have him launch you. After the cut-scene of sorts, you'll pick up the pink wings. Then use your sword on the garden gnome to chop him in half and unlock the achievement.