Full list of all 50 DOOM Eternal achievements worth 1,545 gamerscore. It takes around 25-30 hours to unlock all of the achievements in the base game.
The base game contains 33 achievements worth 1,000 Gamerscore, and there are 3 DLC packs containing 17 achievements worth 545 Gamerscore.
Kill 200 opponents in BATTLEMODE
Kill a Player Demon with each of the 8 Slayer weapons in BATTLEMODE
Heal yourself or your teammate for 50000 health in BATTLEMODE
Do 5000 damage as a Player Demon in BATTLEMODE
Play 25 BATTLEMODE matches
Play as 5 different Player Demons in BATTLEMODE
Complete Extra Life Mode with 10 Extra Lives in your Inventory
Complete a Mission with only the Famine Mode cheat on
Kill the Icon of Sin
Complete the Campaign on any difficulty
Master all Weapon Mods in a single save slot
Collect all physical Codex pages in a single save slot
Kill the Khan Maykr
Complete the toy collection in a single save slot
Complete the cheat code collection in a single save slot
Complete the album collection in a single save slot
Purchase all Praetor Suit Perks in a single save slot
Acquire the Unmaykr
Acquire a new Crucible in Taras Nabad
Beat all encounters and Mission Challenges, and find all Items in Taras Nabad in a single save slot
Complete all Slayer Gates 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
Complete a Praetor Suit Perk category in a single save slot
Kill the Doom Hunters
Fully upgrade Health, Armor, or Ammo in a single save slot
Pick up 20 Extra Lives Total in a single save slot
Kill 666 Demons (excluding Player Demons and Wolves)
Complete a Slayer Gate
Upgrade Health, Armor, or Ammo
Perform 33 Unique Glory Kills in a single save slot
Complete Hell on Earth
Defeat Samur in the Holt (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 1)
Complete all Secret Encounters 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)
Beat Horde Mode
Re-collect all of the weapons on the Weapon Wheel
Complete the first Horde Mode Mission
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)