Here is the full list of all 11 Honker achievements.
Start the game for the first time.
Find the goose with a cowboy hay. Yee-honk!
Bow down! You found the goose wearing a regal crown. All hail!
Struck gold by finding the goose with a miner's hat. A cinematic quest deep into the feathery mines!
Find your first five Geese.
Find ten Geese.
Elementary, my dear gosling, the clues are as clear as feathers in a pond.