Here is the full list of all 12 Nowhere Patrol achievements.
Clear the game with Murky.
100% the game.
Get the best score in every level with all characters.
Get the best time in every level with all characters.
Clear every level without getting hit with all characters.
Get the best score in every level with one character.
Get the best time in every level with one character.
Clear every level without getting hit.
Get an S+ rank on every level.
Clear every bonus with all characters.
Clear every bonus with one character.
Complete the game with any character.