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