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.
Acquire the Unmaykr
Complete a Mission with only the Famine Mode cheat on
Master all Weapon Mods in a single save slot
Beat all encounters and Mission Challenges, and find all Items in Taras Nabad in a single save slot
Complete the cheat code collection in a single save slot
Complete the album collection in a single save slot
Complete the toy collection in a single save slot
Collect all physical Codex pages in a single save slot
Complete all Slayer Gates in a single save slot
Purchase all Praetor Suit Perks in a single save slot
Kill the Icon of Sin
Complete the Campaign on any difficulty
Kill the Khan Maykr
Acquire a new Crucible in Taras Nabad
Pick up 20 Extra Lives Total in a single save slot
Fully upgrade Health, Armor, or Ammo in a single save slot
Complete a Praetor Suit Perk category in a single save slot
Best the Gladiator in the coliseum
Blow a hole in Mars
Spend 8 Sentinel Batteries in the Fortress of Doom in a single save slot
Kill the Doom Hunters
Kill 666 Demons (excluding Player Demons and Wolves)
Complete a Slayer Gate
Upgrade Health, Armor, or Ammo
Complete Hell on Earth
Perform 33 Unique Glory Kills in a single save slot
Complete Extra Life Mode with 10 Extra Lives in your Inventory
Play as 5 different Player Demons in BATTLEMODE
Do 5000 damage as a Player Demon in BATTLEMODE
Kill 200 opponents in BATTLEMODE
Play 25 BATTLEMODE matches
Kill a Player Demon with each of the 8 Slayer weapons in BATTLEMODE
Heal yourself or your teammate for 50000 health in BATTLEMODE
Complete all Secret Encounters in a single save slot (Ancient Gods 1)
Defeat Samur in the Holt (Ancient Gods 1)
Collect all physical Codex pages in a single save slot (Ancient Gods 1)
Acquire all Support Runes in a single save slot (Ancient Gods 1)
Destroy the Life Sphere in the Blood Swamps (Ancient Gods 1)
Complete the UAC Atlantica Facility (Ancient Gods 1)
Complete Extra Life Mode with 5 Extra Lives in your Inventory (Ancient Gods 1)
Collect all physical Codex pages in a single save slot (Ancient Gods 2)
Acquire all Sentinel Hammer upgrades (Ancient Gods 2)
Complete Extra Life Mode with 5 Extra Lives in your Inventory (Ancient Gods 2)
Complete the first Horde Mode Mission
Re-collect all of the weapons on the Weapon Wheel
Beat Horde Mode