Here is the full list of all 19 Funtasia achievements.
Defeat Junky Funky boss
Use the Jumper 20 times
Die 10 times from low battery
Defeat a boss and unlock the skin
Defeat the Tropichedelia boss
Complete a track and unlock the skin
Die 10 times in water
Use the Cleaner 20 times
Collect the required coins in a track to unlock the skin
Die crushed (by a press)
Fully upgrade a car
Defeat the Tumble Dumble Ranch boss
Defeat the Nosferatown boss
Defeat the Baby Land boss
Defeat the DJungle boss
Defeat the Zen Garden boss
Defeat the Kellwasser Park boss
Defeat the Ice-o-Land boss
Defeat the Planet H boss