Here is the full list of all 14 Bitslap achievements.
Score above 5k points in Normal
Hear the 10-second warning three times in one round
Destroy a group of 27 cubes without any mistakes
Destroy a wave of 81 cubes without any mistakes
Hear the 10-second warning twice in one round
Achieve a combo of 2.0 in any difficulty
Score above 15k points in Hard
Score above 45k points in Insane
Finish a wave with 0.1s on the timer
Complete a wave of 81 cubes in Insane
Beat the dev scores in Normal
Beat the dev scores in Hard
Beat the dev scores in Insane
Knock all dev scores off the list