When the app starts, press to move over to ‘Library’ and select ‘Interactive Episodes’.
This is unlocked in Episode 1, ‘Elmozilla’, Chapter 4, ‘Count 6 Coconuts’.
Grover will spill his coconuts all over the street. You have to toss them back in the box for him. When Grover tells you to, just move your arm in a throwing motion to throw them in the box. You have to do this six times.
The simplest way to unlock this achievement is using ‘Chapter Select’ to choose the chapter. When the chapter is over and the next one starts, just press , move over to ‘Stop’ and press again. The achievement will unlock when it is buffering. You can alternatively watch the entire episode, but that would be more time consuming.