There is a 4 byte objective bitflag that is a global variable used by objectives. It is default 00000000, and it can be set and unset by the action blocks. Then, the objectives menu tries to match those bitflags. Objectives are added in the Edit Setup -> Edit Objectives. Add an objective, then add 1A Conditional True. Conditional True means it matches. The example below means the objective will be complete, if the global variable matches 10000000.