Here is the full list of all 14 Garfield Kart - Furious Racing achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Win your 1st puzzle piece
Win your 1st hat
Complete a race in any mode or category
Win all the golden hats
Win all the golden spoilers
Win all 48 pieces of the puzzle
Use all the perfect combos in a race
Win all the hats (16)
Trigger a super cannon start
Get all the spoilers (8)
Use your 1st perfect combo in a race
Complete your 1st image
Win your 1st unique hat
Win your 1st spoiler