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 spoiler
Complete a race in any mode or category
Win your 1st hat
Win your 1st puzzle piece
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