Here is the full list of all 59 Shady Lewd Kart achievements.
Win a gold Plot Cup
Win a gold Flat Justice Cup
Win a gold Cream Pie Cup
Compete in Time Trial
Completely fill Silvie's date bar!
Completely fill Talia's date bar!
Completely fill Sunny's date bar!
Unlock silvie's special animation in No Nut Mode
Unlock Talia's special animation in No Nut Mode
Unlock Sunny's special animation in No Nut Mode
Unlock Detour's special animation in No Nut Mode
Completely fill Ferania's time bar!
Complete a race unharmed
Reach a boost level of 5
Find Terry's Secret Store
Get Ripped Off by Terry
Buy something from Silvie's Store
Spend 20 minutes viewing pictures
Survive a panty shower without getting hit
Select a Waifu Pillow
Collect over 20 Damage Bubbles
Collect over 50 images
Collect over 100 images
Collect over 150 images
Collect over 200 images
Wear a hat or accesory
Participate in an event
Skate a full cup
Complete Detour's Driving School
Don't buy anything at Silvie's Store
Detour shows up in Silvie's Store
Complete a character's story mode
Complete 5 characters' story modes
Complete 10 characters' story modes
Complete 20 characters' story modes
Create a Detour Paradox
Create a Silvie Paradox
Create a Talia Paradox
Create a Sunny Paradox
Find Dave's secret unlock he has hidden in Shady Lewd Kart...
Collect all the gifts in a single race and come first!
Have at least 10000 Coins
Have at least 50000 Coins
Defeat Metal Datura
Buy a ton of pillows
Place first in a race while holding Emotional Bagagge
Complete 40 characters' story modes
Collect over 50 Damage Bubbles
Collect an Ultra Rare Pitstop Panty
Take a photo of some decent bush
Buy some premium femboys
Race with the hottest character, accessory and kart in a cup
Spank Frank with a paddle when in the Newgrounds Tank.
Win a gold Underboob cup!
Completely fill Onyx's date bar!
Create an Onyx Paradox
Unlock Onyx's special animation in No Nut ModeI
Find Dave's Secret Store
Drive a whole cup with the Succulent Chinese Meal kart and the Justice Cap