Here is the full list of all 12 Mervin and the Wicked Station achievements.
Launch the game between 12 and 18 April
Get 50 extra lives
Get 25 extra lives
Get 10 extra lives
Freeze 100 monsters
Complete all the levels
Freeze 50 monsters
Freeze 25 monsters
Freeze a star-villain
Freeze a balleye
Get rid of a banana-leg
Complete the tutorial