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.
Use all the perfect combos in a race
Win all 48 pieces of the puzzle
Win all the golden hats
Win all the hats (16)
Use your 1st perfect combo in a race
Win your 1st unique hat
Win your 1st hat
Win all the golden spoilers
Trigger a super cannon start
Get all the spoilers (8)
Win your 1st spoiler
Complete your 1st image
Complete a race in any mode or category
Win your 1st puzzle piece