Item description:

Load the AUTOSAVE first! it is saved at the finale.
Shoot Ruvik in the chest then proceed through the game and after the credits you will earn:
One Of Many (Defeat Ruvik)
It Is What It Is (Complete game with no upgrades)
First Step Into Darkness (complete game on casual difficulty)

Load up the chapter 2 save next.
Once loaded, turn around and grab the missing poster which is the final collectible and will earn you the Every Nook and Cranny trophy.
After that, continue on with the game until you reach the next savepoint where you can upgrade the remaining skills to unlock 5 trophies:
Hardbody (Upgrade all sebastians attributes)
My Best Friend (Fully upgraded one weapon)
The Power Of Three (Fully upgraded 3 weapons)
Unstoppable Arsenal (Fully upgraded all weapons)
Why Can't I Hold All This Ammo? (Fully upgraded stock ammos)

After all that just head around the back of the office and open the final remaining locker to earn the trophy:
Master of Unlocking (Open all the lockers)

Also note:
400 kill count for One Man Army shouldn't be that far off either, so kill some enemies to get kill count trophies as they stack.
Use the rocket launcher on chapter 6 in the burning house and kill 10 enemies to earn Blow Up The Playing Field trophy.
This save is also best to do the clean up & chapter specific trophies so use the New Game + and Chapter Select feature to clean up the rest of the trophies.