Apologies for the delay, man. I got all of them at once. After completing the transfer and entering that police station scene where you edit your character, I got maybe like 4-5 of them. Then I went to my apartment and chilled inside for a bit and ten minutes later, I got the rest. Then the Stunt Jump achievement was Done! Unlocking… for like 1 day before it popped.
Not sure why they haven't all unlocked for you yet Perhaps try standing in the apartment while idled and some will pop?