The HUDL runs Android software (from Google) and depending on your settings Android can automatically upload your photos from your HUDL to Google Photos on the internet (in the cloud)
Go to the internet on your PC (if you have one) and logon to Google Photos with the gmail address you use on your HUDL and you may find the photos are already there
Here is the link to Google Photos
https://www.google.com/photos/about/
If the photos are hot there go in to the Google Photos app on your HUDL and check the settings are to backup your photos to Google Photos in the cloud.
Once this option is set the photos should start uploading to Google Photos.
I believe you can also put a Micro SD card in your HUDL and copy the photos to that from the HUDL.
Also if you have a PC you can connect the HUDL to a USB slot on your PC (with a cable) and copy the photos from the HUDL to your PC.
Photo are often stored in the DCIM (Digital Camera Images) folder on a camera or tablet so copy your photos from there.
p.s. I don't have a HUDL2 so don't know if all these options will work but they are general options for most smartphones or tablets.