Here is the full list of all 20 #Funtime achievements.
Destroy an enemy by having it cross the same colored path
Complete the level 3 color swap introduction
Achieve 3 stars on any challenge level
Defeat the first #Funtime boss
Connect with an enemy of the same color
Take cover in your first zone
Complete any Funtime mode without being hurt by your wrecking ball
Earn at least 50,000 points with a single bomb
Travel a great distance
Unlock every level
Earn 100 stars
Score at least 100,000 points in any Arcade Mode
Score at least 1 million points in any Arcade Mode
Destroy each of the bosses in #Funtime
Achieve a multiplier of 15 or more
Fully upgrade your ship
Destroy the rarest of enemies
Earn at least 1 star on each challenge level
Complete all 50 waves in Arcade mode
Earn 3 stars on every challenge level