To unlock to the All Your Bases trophy in Far Cry New Dawn, you will need to liberate all 10 of the game's Outposts 3 times.
When you capture an Outpost the first time, it will be Rank I. Once you have captured an outpost, you will gain access to a new workbench. Interact with the workbench and you will have the option to Scavenge the Outpost. Doing this will reward you with 50 Ethanol, but will also hand control of the Outpost back to your enemies and increase its difficulty level by one, up to a max level of Rank III.
You can see the Outpost on your map from the black smoke they emit. The 10 Outposts are:
- The Chop Shop
- Sacred Lumber
- Broken Forge
- The Pantry
- The Watering Hole
- The Refinery
- Trailer Town
- Empty Garden
- The Island
- Signal Point
You can see their locations on the map below:
There is another trophy for liberating a Rank III Outpost using stealth: