Item description:

This is only one save, which includes the 3 trophies not tied to the bosses:

-Underwater Detective Collect all lore items in Storm Breaker : Turn right from the obelisk through the door, straight through the corridor and down the broken window-frame. Turn around and go through the door, then turn right again. There should be a door and behind it the last collectible. See this video for visual help : Video-Link

-Electrifying! Kill 100 enemies with a lightning blaster : When loading up the save, simply kill two more enemies with the Blaster (should be equipped).

-The Last Defender Finish the Nayra questline : Port to "The Deep". From there go along the cliff, up the narrow bridge. Move forward through the tunnel and keep left. Drop down,continue to keep left, drop down next to the enemy with the big arm-gun. Straight ahead you should see another tunnel under a huge rock, Nayra sits further in the back. The video above shows the spot (from 3:33 Abyssal Link, but coming from the other side. Talk to her until the trophy pops.

This save was made at the end of the DLC in free roaming, so the bosses are already dead. These two you have to do yourself.