Here is the full list of all 10 Secret Neighbor achievements.
As a Detective, find 4 keys by the photo in one match in quick game.
Win as a Neighbor while the basement door is open in quick game.
As a Bagger, fill all 4 slots with keys in quick game.
Open all locks in one match by yourself in quick game.
Win without seeing the Neighbor for the whole match in quick game.
Exile a raven 5 times in one match in quick game.
Be the first child to get into the basement door in quick game.
Get caught in the hands of a Neighbor five times in one match and survive in quick game.
As a Leader, encourage 200 people by your ability in quick game.
Win without turning into a Neighbor even once per match in quick game.