The The Ancient Gods - Part Two Add-on for DOOM Eternal has 7 achievements worth 250 gamerscore.
Complete Extra Life Mode with 5 Extra Lives in your Inventory (Ancient Gods 2)
Kill the Dark Lord (Ancient Gods 2)
Complete Immora (Ancient Gods 2)
Collect all physical Codex pages in a single save slot (Ancient Gods 2)
Acquire all Sentinel Hammer upgrades (Ancient Gods 2)
Complete Reclaimed Earth (Ancient Gods 2)
Complete World Spear (Ancient Gods 2)