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Observer

View 3 replays in the Replay Channel.

Observer-0.1
1 guideOnline Game ModeCommunity
niteowl1980niteowl1980513,921
18 Jan 2015
1 0 0
This can be done at anytime. From the main menu go to network - Playstation network - replay channel - new replays - and from here you can view three replays of matches played by others on the PSN. It unlocks as soon as the third replay starts playing.

I also saved them before exiting but I'm not sure if this is a requirement of the trophy.