Horizon Zero Dawn
79 Achievements
62-78h
PS4
First Core Overridden
Reached the Core of a Cauldron and accessed its information. Details for this achievement will be revealed once unlocked
43.0%
How to unlock the First Core Overridden achievement in Horizon Zero Dawn - Definitive Guide
The first cauldron encountered is Sigma. It is North of Mother's Crown (in the 2nd valley; 1st one after The Embrace) and on the map as a blue triangle. Cauldron's are the equivalent of a (machine) dungeon. Aloy goes through, fights enemies leading up to a 'boss', clears the cauldron. At the end of each Cauldron, Aloy learns how to over-ride more machines. Happy Hunting, I hope this helps. :)
Please see All Cores Overridden for more information.