Sharing my experience, when it comes to achievement hunting, this is how I obtained all the trophies/achievements in all three Metro games (Base game achievements) on the PS4. And in your case, how did you complete all of them on separate playthroughs?
Metro 2033 Redux
First Playthrough:
Survival mode
All 51 Diary Pages
50%-60% of Moral Points
Enlightened (Good) and Ranger (Bad) endings
Getting 44/50 trophies
Second Playthrough:
Spartan mode
Getting the remaining 6 trophies + Platinum trophy
Metro Last Light Redux
First Playthrough:
Survival mode
All 43 Diary Pages
60%-75% Moral Points
Redemption ending (Good Ending)
Getting 46/50 trophies
Second Playthrough:
Spartan mode
C'est la Vie ending (Bad Ending)
Getting the 3 remaining trophies + Platinum trophy
Metro Exodus
First Playthrough:
Reader difficulty
All 71 Diary Pages
All 13 Suit Upgrades
All 21 Postcards
Your Destination ending (Good Ending)
Full Strength
Getting 46/50 trophies
Second Playthrough:
Ranger Hardcore difficulty
Eternal Voyage ending (Bad Ending)
Getting the remaining 3 trophies + Platinum trophy