http://www.youtube.com/playlist?list=PL1uvfI9kCKbkYYzdpa_5td...I posted a video guide for all 26 level of runs that I did myself. It is a very challenging trophy a few general tips would be ,
remain calm usually you have a little more time than to just run through at top speed (the longer the level the more generous they are with time typically).
On the bridge levels there is a rope glitch to allow you walk on the ropes. I recommend to use it sparingly because it is heavily unreliable.
On lights out get the gold gem so you can use the shortcut to the end.
On fumbling in the dark, there is one point where you have to run in the darkness for a second, just remain calm and hit the nearby enemy into the nearby aku aku box.
And Sunset Vista is a pain because it is incredibly long, just stay calm and make calculated decisions the time frame on that level is extremely generous even for Platinum.
My final count was 14 platinum and 12 Gold it is very doable just requires a lot of perserverance, not dying and going fast can be difficult, don't be afraid to do some practice runs to learn the best strategy/route.
*Warning*
Beware of the auto save, after I earned the trophy I quit out of the game and all the Time Trials I had earned were gone. I don't know why it did this but just be careful when quitting the game. Fortunately I was already awarded the trophy, but it was annoying and could cause people to have to replay TT's they already have won.