Here is the full list of all 11 The Pest achievements.
Start your Journey!
Complete Chapter 1
Complete Chapter 2
Complete the game with any of the possible ways
Defeat Big Red Johnny
Defeat the Creator
... For once? Backwards, really fast, as fast as we can... Really put the pedal to the metal, y'now?
Find the secret ending
Unlock all story Easter Eggs
Unlock every possible choice
Beat the game