1. In the woods by the stump with the skull --> kill an Elite Soldier in the underground to finish the quest. Make a savegame beforehand, the spawned monster is random.
2. In the underground laboratory. You have to put in the password for Alexa on the top level first:
Then talk to the body in the laboratoy. You need some genetic code (monster drop, crafted or random reward) and the voice drone from the tunnel around the corner.
3. Behind the barn is a bench where you can witness a memory. You have to find five additional memories in the city behind the garage, two in the underground and the last one in the house by the same bench.
Talk to all mounds afterwards again to complete the quests (skull in the woods, city bone hoard and the tube in the laboratory). You have to complete this quest to really start the chapter, you can complete everything on the first day easily.