Sose

You’re right, Waseem... The challenge seems to be glitched. For some players, it only works during the Nile Guard mission and only when using the main tank shells, then switching to knife-only or pistol-only (other challenge) Plenty of players on Reddit & Steam have reported the same issue and Nile Guard is the only mission that seems to work

There is a part of this mission where you need to fire from a MG on a vehicle to protect the President, not sure if that counts against this but I didn't get the challenge completed