i do believe there is a chance to get the weapons from Reda's daily quests. will check it for sure and drop a link with info later
The games director said that the only thing in the store not available in the game was the maps.
See this link... https://support.ubi.com/en-GB/Faqs/000031908
with this comment "...All items available on the Store are also unlockable by playing the game..."
...and this comment from Ubisoft, from a separate link.
(maps) “are not technically in-game items and can only be obtained with Helix Credits. The locations that those maps highlight can be discovered in the world and explored by just playing the game.”
I hope this helps.