This is Story Related and CANNOT be missed.
This achievement is unlocked after completing Level 2. Simply play through Level 2 following the in game prompts on where to go and what to do. To help with some of the badges and bug collecting later it is in your best interest to play through the majority of the level with Russell. Playing as Russell you can collect bugs with your net. When you are near the bugs press the
Button to catch them. You will need to collect a number of different bugs throughout the game so go ahead and start now. Press the
to change characters.