Here is the full list of all 33 Smurfs Kart achievements.
Get hit by your own acorn
Enter your own bug
Finish your first cup
Finish a race with hiccups
Pass the finish line in reverse
Doze off for 5 minutes
Hiccup 100 times
Use the abilismurf of each Smurf
Do 75 super-jumps
Finish a Grand Prix with 1 perfect start per race
Fall into the water 25 times
Do a lap without getting hit or colliding
Use 7 sarsaparilla leaves during a race
Spend 13 minutes in the air with Astro Smurf
Receive the Smurfing Smurf medal 5 times
Receive the Smurfy Smurf medal 5 times
Collide 600 times while playing as Hefty Smurf
Collect 600 berries with Farmer Smurf
Jump with Smurfblossom 1,200 times
Spend 5 minutes off-road with Smurfette
Fall off the edge with Clumsy Smurf 40 times
Finish a lap in 1 minute 0 seconds with Clockwork Smurf
Skid continuously for an entire lap
Finish first after 12 races in Free Race mode
Send 250 gifts with Jokey Smurf
Send 250 cakes with Chef Smurf
Build 250 drones with Handy Smurf
Make 250 Smurfs fall asleep with Papa Smurf
Hit 150 opponents with acorns while playing as Smurfstorm
Unlock all mirror cups
Win a Grand Prix without using any items
Unlock all stickers
Get all gold medals in the Time Challenge