Full list of all 10 Lake achievements worth 1,000 gamerscore. It takes around 6-8 hours to unlock all of the achievements on Xbox One.
Go back to the big city
Stay in Providence Oaks
Leave in the RV
Help Mildred by taking Mortimer to Burt
Help Angie by delivering the moviebox
Help Steve out both times
Help Nancy by testing the photo camera
Reach the hill with the church
Climb the watchtower
Talk to Andy the detectorist