The Ancient Relics Story Pack Add-on for Stellaris has 9 achievements.
Complete the Baol Precursor chain
In one game, find 5 Relics from Ancient Relics Story Pack
Have 100 Minor Artifacts
Study Minor Artifacts and discover a random technology
Use the active effect of a Relic
Find a Relic
Successfully investigate an archaeological site
Complete the Zroni Precursor chain
Capture the Galatron from another empire