Borderlands 3

There are 13 side missions and 9 crew challenges to complete in this DLC so see below for more details.

Side Missions: - These are listed in the order you should encounter them in but most will appear either when you first enter an area or when you get within a certain distance of their location marker.

Blast Requests
Laid to Rust
Hot and Unbothered
A Good Egg
Krieg's on Parade
Scratch, Don't Sniff
That Rings a Something
Brainstorm
Check, Please
Don't Call it a Rorschach
Does a Body Good - The location marker for this side mission has an abysmally short detection distance so won't appear until you're almost on top of it.
It's an Allegory
Remodel Behavior

If you're having trouble finding any of these side missions, then please see the following video by goodgamez:

https://www.youtube.com/watch?v=WuI-MpKhc64

Timestamps:

00:00:00 - Check, Please
00:16:19 - A Good Egg
00:27:52 - Remodel Behavior
00:44:01 - Laid To Rust
00:47:03 - Hot And Unbothered
00:49:01 - Blast Requests
00:50:14 - Krieg's On Parade
00:52:31 - Brainstorm
00:53:30 - Scratch, Don't Sniff
00:54:37 - That Rings A Something
00:55:30 - Don't Call It A Rorschach
00:58:55 - Does A Body Good
10:00:16 - It's An Allegory


Crew Challenges:

Signal to Noise

The Probes look like this on the map but unlike the crew challenges in the main game and other DLCs, there is no central location where you can check which ones you have and haven't found:
 

The game doesn't explain the Probe mechanics at all but what you have to do is destroy all the Memory Orbs that are attached by Mind Threads to the central dispenser. Annoyingly, some of the later Probes have multiple false Memory Orbs that have nothing to do with the crew challenge so pay attention to the trajectories and only destroy the ones with Mind Threads attached to them. Also note that you only have approx 10 seconds to destroy all of the relevant Memory Orbs for any given crew challenge, else you will have to redo them from scratch so use a decent Sniper Rifle and don't miss!

Castle Crimson:

Probe 1 is on a ledge to the far right of the first jump pad you come to in Castle Crimson.



Probe 2 is on a ledge opposite the path that leads away from the second catapult. To get up there, you have to parkour your way up the cliff opposite the respawn point.



Probe 3 is on a ledge near the top of the Escher-esque puzzle room. To reach this one, climb up to the pile boxes on the South side then follow the path round until you're facing the probe and able to jump over to it.



Sapphire's Run:

Probe 1 is on a floating platform opposite the marker for the side mission "Krieg's on Parade". To get up there, use Maya's book on the nearby plinth which will then summon a platform you can use to reach the probe.



Probe 2 is on a piece of floating debris that is diagonally opposite the "Brainstorm" side mission but as before, use Maya's book on the nearby plinth to summon some platforms you can use to jump over to it.



Probe 3 is on a floating platform in an area to the left of where you teleport to when trying to cross the bridge that Locomobius destroyed. Use Maya's book with the nearby plinth to summon a platform you can use to jump over to the probe.



Benediction of Pain:

Probe 1 is on the edge of the cliff that is directly opposite the Handsome Jack mask in the first area you come to. Note that the location marker for this probe has an abysmally short detection distance so won't show up until you're almost on top of it.



Probe 2 is on the edge of the platform opposite the Electrified door you have to open.



Probe 3 is on the edge of a cliff in the area where you have to take out the Wardwatcher.



If you need any additional help finding the probes, then please see this video by Gaming with Abyss:

https://www.youtube.com/watch?v=OS7RQZMB4G0

Timestamps:

Castle Crimson Crew Challenges:

(0:05) 1/9
(1:18) 2/9
(2:02) 3/9


Sapphire's Run Crew Challenges:

(3:02) 4/9
(3:48) 5/9
(4:46) 6/9


Benediction of Pain Crew Challenges:

(5:42) 7/9
(6:26) 8/9
(7:04) 9/9