Item description:

Walk up to the waterfall for HOS
(Cursor already on it - press X)
Solve HOS
**View Screenshot For Item Locations**

1 At Waterfall To Start HOS
2 HOS - 1 Item Left - Press DOWN on D-Pad

The trick for Speed Reach trophy....
Work on the HOS until you have only a single item left to find
Switch to Dominoes (Press DOWN on D-Pad)
There will be only a single target area left

NOTE:
The clock doesn’t start until you switch to the dominoes game
and it shouldn’t be hard to build a chain to that single area

ATENTION:
I already unlocked the Speed Reach trophy from folder 04
and I have not tested the 2 saves on an alt acount
But I did start a new game to get the domino related trophies
so I don't see why this won't work