Missing that 100% achievement for Borderlands 4? It may be because you're missing the hidden mission 'Ice Fishing' from the new Mad Ellie Story Pack DLC! Here is a full guide on how to unlock and complete it.
How To Complete The "Ice Fishing" SECRET Mission In Mad Ellie & The Vault Of The Damned
Overview
Let's do some Ice Fishing!
To start your unlock journey for this hidden quest, you'll need to first navigate to the first fast travel station of the DLC in the top left corner of the map.
We'll be doing some ice fishing to find 4 Echo Recorders needed to make this mission show up. There are numerous locations for the fishing spots you'll find them at, but you can complete this step at any of them.
For simplicity however, here is 3 locations right next to travel station. You can run back and forth between them as needed

When you get to each location, you'll be looking for a bucket of dynamite nearby, and most importantly- splashing particles in the body of water nearby.


Once you pick up a stick, simply throw it at the splashing location, and you'll be greeted with a burst of objects which will be thrusted into the air.
What we're looking for, is a golden echo recorded which will stick out like a sore thumb. Simply pick it up (even if it fell under the water) and a dialogue cue will play.
After 4 Echos have been retrieved, you can start the hidden mission.
Back to the lodge
Open your world map and check the bottom left. Over the travel station area for the Speakeasy you should now see a new mission titled 'Ice Fishing'

After heading back to the Speakeasy and interacting with the quest giver located in the top left corner of the building, you'll be asked to go and find a shack back out in the world.

Once you travel to the location marked, you'll need to listen to another set of dialogue, before picking up some more dynamite and throwing it at a nearby ice cap in the snow.
Doing so will spawn a boss which can be killed for a chance at 1 of 9 dedicated drops, prior to the end of the mission.

Completing the mission will reward you with an achievement, and help tick off your progress to the goal of 100% (assuming that's what you're after!)
Summary
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