You need to go through all the levels of the second board and do all the objectives. Here is a video made by myself showing you how to handle the different missions. Please note the following videos were made with the W8.1 version of the game. Some levels can have different camera orientations.
If you only need a few levels, you can watch the specific video guide below.
Level 2-1 :
Level 2-2 :
Level 2-3 :
Level 2-4 :
Level 2-5 :
Level 2-6 :
Level 2-7 :
Level 2-8 :
Level 2-9 :
Level 2-10 :
Level 2-11 :
Level 2-12 :
Level 2-13 :
Level 2-14 :
Level 2-15 :