Here is the full list of all 9 Breakout Survivors Demo achievements.
Clear Wave 5.
Clear Wave 10.
Clear Wave 15.
Clear Wave 20.
Don't lose a single ball during a Wave.
Clear the first 5 Waves with only Perfect Clears.
Clear the first 10 Waves with only Perfect Clears.
Clear the first 15 Waves with only Perfect Clears.
Clear the first 20 Waves with only Perfect Clears.