Also, is there a complete list of them? The trophy room seems to have space for 12 trophies, but I can only seem to locate 9.
There's 9 of them; 12 slots are reserved for DLCs(as you can see by trophy at the bottom). Here's source with links to details about trophies.
- Guild Seal
- Saker's Flag
- Simmons's Head
- Balverine Head
- Gnome Trophy
- The Complete Works of Philipth Morley
- Orb of Magicka
- Chicken Trophy
- Teddy Bear (Traitor's Keep DLC)