Here is the full list of all 24 Tropical Demo achievements.
Wake up Adele so many times she'll get angry
Win a football match with Marlene
Drink rainbow
Talk with duck
Click on the passage leading to nowhere
Finish the first day in Tropical
Make Jacob win the race
Finish the race in 120 seconds or faster
Click on pizzeria during the nightmare
Try to enter the garage during the nightmare
Click on watermelon
Click on every minigolf stage
Slide on a tray on Lagoon waterslides
Find swearing parrot
Try every waterslide in Tropical
Ride a turtle
Click on frogs enough times so that Dominica decides to try her old style
Crash scooter into all of the characters
Click on one of the purple-blue parrots flying nearby the disco
Offer starfish a beer
Ride a manta
Talk with Marlene about the Tropical sequel
Try to open locker 3188