We already had a suggestion to add more trophies and it got implemented. However, there is no wiki page listing all you can get. My suggestion is to simply add the trophy list to the wiki.
Yup! You can also get there by clicking on your trophy point total on your profile and using the 'View all available trophies' button. The known ranks are on the wiki!
As previously mentioned, there is a page for Forum trophies - It is linked from the wiki - so there would be no reason to have a wiki page containing that redundant information, that would needlessly introduce the possibility for them to become desynchronized.