Full list of all 50 DOOM Eternal achievements. It takes around 50-60 hours to unlock all of the achievements in the base game on Windows.
The base game contains 33 achievements, and there are 3 DLC packs containing 17 achievements.
Complete the UAC Atlantica Facility (Ancient Gods 1)
Destroy the Life Sphere in the Blood Swamps (Ancient Gods 1)
Defeat Samur in the Holt (Ancient Gods 1)
Complete Extra Life Mode with 5 Extra Lives in your Inventory (Ancient Gods 1)
Acquire all Support Runes in a single save slot (Ancient Gods 1)
Complete all Secret Encounters in a single save slot (Ancient Gods 1)
Collect all physical Codex pages in a single save slot (Ancient Gods 1)
Acquire all Sentinel Hammer upgrades (Ancient Gods 2)
Complete Extra Life Mode with 5 Extra Lives in your Inventory (Ancient Gods 2)
Collect all physical Codex pages in a single save slot (Ancient Gods 2)
Complete the first Horde Mode Mission
Re-collect all of the weapons on the Weapon Wheel
Beat Horde Mode