Note: During this episode you will need to do the achievements 815 and Save the Castaways.
As soon as you wake up in the jungle, get your bearings and look for a woman. Follow her and you will soon find Kate. Talk to her and you have your first flashbac. At this point, do the "815" achievement. Afterward, talk to the hostess. You will return back to the island and speak with Kate once more. She will point you in the correct way, go there and follow the dog. Keep hold of to run and keep up. Soon, You will be at the beach. Find Jack, He will be reviving a survivor and wearing a black suit. He will ask you to fix the fuse leak. At this point, do the "Save the Castaways" achievement. After, head left on the beach and examine a backpack and you will be done with Episode 1.