Here is the full list of all 23 Citrouille achievements.
Free all hearts during a single bonus level
Continue after a defeat
And it's only the beginning
What is this button for?
Finish a game in versus mode
Hit the same ghost 10 times
No!
Plant 15 flowers with Praline during a single spell
Kill 7 monsters with one Vanille spell
Finish story mode with Praline
Finish story mode with Vanille
Defeat the boss without dying
Gimme some hearts
Use Vanille spell on your teammate
With Vanille plant 65 flowers in a single level
Finish arcade mode with Praline in "Praline & Vanille" story
Finish arcade mode with Vanille in "Praline & Vanille" story
Finish normal mode with Anis in "Anis & Reglisse" story
Finish normal mode with Reglisse in "Anis & Reglisse" story
Finish arcade mode with Anis in "Anis & Reglisse" story
Finish arcade mode with Reglisse in "Anis & Reglisse" story
Kill the cat queen with Reglisse's spell
Kill 5 chicks with Anis's spell