How to rescue my lost APFS partitions
Run Disk Utility from Recovery Mode
On Reboot, press Cmd-R
Open Disk Utility.
Select your partition one by one and hit repair a couple of times.


If you have another Mac, you can mount your MacBook partition using Target Disk Mode. Connect both Macs with Thunderbolt/USB-C cable. Reboot your MacBook, then immediately press and hold T while it starts up. Hopefully your APFS partition will show up. Note: Both Macs should be using APFS volume.