Here is the full list of all 21 Guard Duty (EU) trophies - there are 6 bronze, 5 silver, 9 gold and 1 platinum.
Deliver the news to King Theodore
Find a quiet place to get dressed
Girtrude finds a new friend
Make a charitable donation
Get kicked out of the Castle
Get all other trophies
A book bound with flesh
Translate the creepy book
Successfully snap a photo
Get the Wildlands DLC
Fail to make it across the Elder Scar
Deal with the Spider
Return the paint to it's rightful owner
Venture North, beyond the Scar
Find a way to open the door
Meet the Guardians
Insult to injury
Never give up
Something amiss
Rendezvous with a familiar face
End it, once and for all