Here is the full list of all 18 Paddle Battle achievements.
You avoided fireballs for over 20 seconds!
You avoided fireballs for over 30 seconds! Look at you! Great job!
You avoided fireballs for over 40 seconds! WOW!
Player 1 won the game!
Player 2 won the game!
Player 3 won the game!
Player 4 won the game!
Nobody else got any points... How embarrassing!
You defended your goal against the slow balls for 30 seconds!
You defended your goal against the slow balls for 45 seconds! Gosh, you're great!
You defended your goal against the slow balls for a minute! Daaaaaaaaaaaaang!
You won a race in under a minute!
You won a race in under 45 seconds! Wow so fast great job!
You won a 3 or 4 player race in under 30 seconds! You probably cheated!
You lasted 35 seconds without being pushed off the screen!
You lasted 40 seconds without being pushed off the screen! Whoa
You lasted 45 seconds without being pushed off the screen! You win at this.
You started playing Paddle Battle! Look at how much you've achieved already!