Main storyline so unmissable. CONTAINS SPOILERS.
- Use Fast Travel station and get to your friends
- Go to extraction point
- Cross waterway
- Pick up lunar supply beacon
- Kill Gluttonous Thresher
- Go to Overlook and deploy beacon
- Establish Fast Travel link and defend it
So Sanctuary left you behind and you have to search for them, dicks. So you have to go to The Fridge (not the one in real life) and make your way to Overlook, first you have to fight through some Rats (not the little things) as well as should be your first encounter of Crystalisks, to defeat them shoot the crystals on their legs, high-powered sniper works best from a distance in my opinion. Eventually you'll make it to the door out, you'll now be in the Highlands Outwash, the Angel will try and make you use the Fast Travel station here but it doesn't work.
Now you can either fight your way through all the needle stalkers and loaders/combat engineers or you can do it like I did. Run through it all and kill when needed before moving again. Eventually after you get through everyone you'll go through a new door and reach a new save point, if you're solo, don't die, the save point is after the constructor bot. And this is the real fight, you have to fight the Gluttonous Thresher, shock weapons are best but fire or explosive works also. When it turns blue its regaining its shield and watch out, it always tries to slap you with a tentacle either depleting it or getting really close, and if you're to far away it will throw balls of goo at you.
After you defeat it pick up the beacon and enter the Highlands. You'll enter the town called Overlook and have to deploy the beacon and defend it will it searches for Sanctuary or something like that. You'll have a bunch of robots to defeat and a constructor, if you want an easy way I just got in a vehicle and kept shooting at them until almost all died than just go in and finish them off. Eventually it will finish and you will have to go to the fast travel station right beside it and fast travel to Sanctuary. Go to talk to Roland again and BAM, achievement unlocked.