
I've downloaded the game again from PS Plus Extra due to the servers going down on August 12
and just found out that the trophy Gatherer is still obtainable even after getting 50% of the collectables.
Simply pick up 1 more collectable and the trophy will pop. Method tested on a dummy account.
An easy one is the newspaper (Vektan Daily) at the beginning of Chapter 4 — The Patriot (at 00:37):
Killzone Shadow Fall - Chapter 4 - All Collectible Locations (Audio Logs, Dossiers, News, Comics) - YouTube
(I do not own this video).
You will find a save for the other trophies right here. Good luck!
Link to download the US LATAM DIGITAL original (10,5 MB):
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(lower right, under user postbit) to see the download link.
This save was tested by ðŸ†ðŸ…°ðŸ…¶ðŸ…¸ðŸ…½ðŸ…¶ as of Patch 1.81 in July 2022 (PS4 System Firmware 9.60)

For exclusive use on PlayerSquared.