You cannot progress further without PS+ because those strike missions require a fireteam which is online play.
Regarding PS+ info
https://www.bungie.net/en/Help/Article/12135
[quote]PlayStation®Plus works differently for the PlayStation 3 and PlayStation 4 consoles.
PS4: PlayStation®Plus is required to join Fireteams and play some online activities, such as Strikes, the Raid, and the Crucible.
PS3: PlayStation®Plus is not required.[/quote]
English
-
Thank you for the response. Having to purchase yet another service in order to complete the last sub quest is a bit like finding out that in order to finish the last chapter of a book I need to purchase it separately. Are you aware of any complete quest lines that do not require PS+?
-
You're welcome. Any quests that require a fireteam involve matchmaking my guess would be that. Not quite sure though.