First, download these files;
Follow the order below to look legit;
1 - The Floor is Lava; Run file 00 and kill the last boss. It will be easy, just attack him r-quickly, he should die in 3-4 hits.
2 - Farewell, Fateless One. Use this same save, after you kill the last boss, and go to the indicated point on the map and finish the dlc story.
3 - Gatekeeper; Run file 31, close the last portal behind you and the trophy will pop.
4 - Customer Service; Run file 02 and talk to the npc in front of you, the trophy will appear.
5 - use this same file to get armor related trophies. Very easy;
Just follow this guide and you will get these last 3 trophies in 10 minutes.
So that's it, hope I helped.