Here is the full list of all 10 The Groom of Gallagher Mansion achievements.
Went over the details of the field mission
Planned out your own wedding
Knowledge is power!
Looked for hidden passages in the mansion
Revealed who your co-conspirator was
Solved the mystery of the Gallagher Mansion
Fulfilled a hundred year old wish for happiness
Fulfilled your original mission and scored one with the bestie
Death is just a new beginning!
Isn't it such a beautiful thing?