Create missions system like subway surfer or Danger boat

just want to create a mission system just like it is in games like subway surfer or Danger boat, What i have to achieve is i will have a list of 50 mission out of which only 3 will be open to achieve it, once i have finished any of those 3 missions then i will open next mission.
How can I do that, suggestions pls.

I have to do the same as its shown in the attached image
Thanx in Advance.

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solved…